One thing I want to ask, though, is whether the basic airframe MIGHT be capable of supercruise or supersonic flight. See, a big problem with the flying wing (or BWB) design is the limited payload due to volume considerations. However, payload is a question of payload quantity over time; if you're fast enough to make twice the sorties with half the payload, you're delivering the same amount of ordinance over a long period of time.
Moreover, an important consideration, considering that the aircraft is designed for range, is that range is the enemy of speed. The faster you go, the more energy you consume in defeating drag, especially once you get over the Mach barrier. Might it be possible that the H-20 is, first, extremely long-ranged, but that it's also supersonic / supercruise capable, so that its payload problems can be compensated for by a higher sortie rate at short range?
Supersonic flight creates an area of air that is heated due to compression. This is an excerpt from a CSBA study on future trends in air to air warfare - pages 37 and 38
The simplest conclusion from this is that either you move at high sub-sonic velocities avoiding supersonic flow - below Ma 0.8 - or you move at high supersonic speeds to capitalize on velocity and energy as combat parameters - that is Ma 2.0 and more. Once you add fuel and range requirements it is fairly obvious that only high subsonic profile is viable.
The shape that is shown on the images with long thin wings at low sweep angle is not a high-supersonic profile. So while theoretically the plane might be capable of supersonic flight it will not be its default mode of operation because there are no benefits to that.
There were benefits to high speed when missiles and detection were less developed than today. There's no way any aircraft can outrun a dedicated long-range missile, let alone a swarm of them which is linked with a network of sensors. At high supersonic speeds the target creates so much heat and has such a distinct trajectory that it isn't a challenge to write an algorithm that follows it with minimal error. Intelligent IR missiles would quickly put an end to this tactic which is why nobody is really eager to explore it. Low speeds, flares and maneuvering to evade small short-range missiles with small sensors is a viable solution because the capability of the missile is limited. High speeds and no maneuvering to evade a large long-range missile with good sensors is not a viable solution because the capability of the missile has no real upper limit. If you are targeting a strategic bomber then throwing a fighter at it like a Kamikaze is a viable solution.
Overall, I see the H-20 more as an equivalent to the J-20, i.e, it's intended to be the design basis of a family of aircraft, as opposed to a be-all / end-all like the F-35. The BWB as opposed to flying wing design implies that it should be possible to expand the main body more easily, since the BWB is more plug-and-play when it comes to the wings in terms of stealth design. Likewise, it should also be possible to stuff afterburning engines and supersonic-capable intakes onto the bomber, although the drag level is going to be constant.
It is kind of off-topic but it's always useful to remind people of history. F-35 shouldn't be used as example of anything else than what it is - a scam and a market coup. It is not a "be-all/end-all, signed: Pentagon" aircraft. It is "give us fighter monopoly in all but name, signed: Lockheed" aircraft.
The reason why F-35 has three distinct variants that pretend to be "one plane" so the manufacturer can lay a false claim to economies of scale was so that it would monopolize the fighter market for the winner and put the competitiors at a disadvantage. That was the plan for Lockheed to win the merger game in the 1990s and those decisions were taken in 1991.
This is why Lockheed was so strongly in favor of the program - it was the inspirator of the USMC's CALF (replacement for Harrier) which then was merged with US Air Force's JAST (replacement for F-16) due to Lockheed's efforts. There was no logic for it but defense budgets were slashed across the board and only Lockheed's F-22 and McDonnel's Super Hornet programs were continued so the JSF was promoted as the only viable direction. The reason why JSF was the only viable direction was because otherwise personnel and structure would have to be cut. When Pentagon was faced with that alternative they said "doesn't matter if it's another F-104 just keep the jobs in industry and in the military" and we'll get you the money. And Lockheed did just that.
With JSF intended to be a "single plane" there was no way for minor companies to compete which hastened mergers.
Mergers happen when company with more capital buys out company with less capital. The problem for Lockheed's competitors was that the only company with sufficient capital to play the merger game was Boeing which had no experience in designing fighters. Northrop had to reinvent itself after the failures of B-2, YF-23 and A-12 which were all political in nature. They couldn't compete with Lockheed due to politics and with Boeing due to size, so they took what they could and used it to collaborate with Lockheed.
Then the pressure on JSF to perform up to promises grew as the ATF program was slashed further. This is the history of the ATF:
1981-1986 - Pentagon plans for 750 ATFs at cost of $26.2 bn. and production beginning in 1994 to replace F-15A and C.
1990 - total number is reduced to 648 as a result of Dick Cheney's major program review which also revised Boeing C-17 from 210 to 120, Northrop B-2 from 132 to 75 ( 20 in 1992) and cancelled the A-12. You can already see that the political connections of Lockheed paid off already.
1997 - total number is again reduced to 339
2003 - total number is reduced to 277
2004 - the program is funded for 183 aircraft at cost of $62 bn. Again Lockheed's connections show because USAF requests 381 aircraft even though there is clearly no need for the plane with no peer opponent and F-35 in development. Upgraded F-15s would satisfy the actual needs (see: F-15EX) but F-15s were produced by Boeing.
Everything in the JSF/F-35 program is aimed at providing Lockheed with a de facto market monopoly.
That being said the F-35 clearly is a family of systems. It's just that it's all backwards.
Traditional family of systems begins with an airframe that is then adapted to different roles and can even be manufactured by other companies, while the complementing systems can be used in other aircraft.
The F-35 family tree begins with the business control and market share of Lockheed Martin corporation and then splits into three distinct families of aircraft - F-35A, F-35B and F-35C and the numerous special variants for export customers which differ by small details in low-order hardware and software - with IP protections embedded at every stage so Pentagon is kept hostage.
That's it. The F-35 doesn't make sense as a plane, as a platform, as a strategy, as propaganda - until you realize that it's not about military strategy and winning wars but business strategy and winning revenue and profits. For those who were living under a rock - the Pentagon wants to ditch the F-35 (NGAD, MR-X, F-15EX etc) but it can't precisely because the coup was successful.
Let't not use F-35 as a reference point for things which are not business coups and moneygrabs please.
End of off topic.