I actually think people may need to tone down their expectations for how comprehensive the J11BG upgrades might be.
Taiwan’s F16A/B upgrade to F16V standard may be a good case study to examine as a potential parallel, with particular interest in the choices that were made and their limitations and consequences.
The F16 upgrade was basically a bare bones most cost effective approach. The downside was somewhat exposed in the investigation to the first recent crash where it was revealed that the mission computer wasn’t upgraded and would sometimes become laggy to the point of being dangerous. The RWR, GCAS and many other key subsystem were all not upgraded, party to save costs, partly due to power limitations.
This neatly illustrates the choices that may need to be made in terms of what systems you want to upgrade and the trade-offs and opportunity costs involved in terms of what you prioritise power allocations for. Indeed, one of the big watch outs is whether they are doing an engine change as part of the upgrade, as that could give some clues as to the extent of the upgrade. As a general rule of thumb, if they stuck with the AL31, chances are the upgrades are modest; whereas if they changed to WS10A, then the chances are greater than it’s a more comprehensive upgrade. This is because changing the engine also gives you more scope to also significantly upgrade the power generation capacity of the plane to give you more upgrade potential in terms of the systems you can power.
While it would be great if they make it a J16-lite, but even a more modest upgrade will be immensely valuable. We know from anecdotal stories that the radar range can basically half due to aging, so just getting a bare minimum radar refresh to restore that lost range will be a huge boost.
I personally think the upgrade will probably be a bit middle of the road in that it might surprise some in terms of just how high spec the new radar is, but people might also be a little disappointed in how modest upgrades in other areas like EW and precision strike might be. All of those choices will boil down to intended use case.
With the sheer number of 5th gens the PLAAF now operationally fields as well as with CCAs and 6th gens on the horizon, I just don’t think they really need the J11 to overcrowd the frontline combat airspace.
Instead, I see the J11s being used more as missile truck backup for J20s and J16s, but also to act as sweeping forces to deal with incoming cruise missile and suicide drone swarms that your tip-of-the-spear assets might be loathed to waste their payload on, or your top end assets might be otherwise engaged against enemy tac air coming in on coordinated attacks with the missiles do drones.
The Flankers big weapons load and long endurance makes it ideal for this role, and a big radar upgrade would ge warranted to help them find stealth cruise missiles and small drones.
This may also extend to the weapons load out, as I see it potentially more useful to arm these J11BGs with cheaper, large volume weapons like laser guided rocket pods for anti-drone spam work than to give it PL15/17 capabilities. They may well add PL15/17 if they are using an off the shelf radar suite that’s already had the integration work done, but I just won’t expect them to be hanging PL15/17s much, if at all.