@Cute Orca posted something on Weibo back in June that now appears to be the clearest hint regarding the H-20's design:
#H20Design#
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A combat radius of 6500km-7000km would enable stealth penetration via the Arctic route. Launching 5000km-range HGVs/HCMs from over Canada could cover virtually all of North America except Mexico, including the entire territories of Canada, the continental United States, and Alaska.
Achieving standoff coverage over the entire continental US from Northeast China would require a combat radius of at least 11500km, which is highly demanding. While the B-2 has an 11000km combat radius, it comes with exploding costs and low payload efficiency. Alternatively, a one-way suicide mission could be considered... Therefore, covering the continental US still depends on air-launched long-range weapons.
From Northeast China or the Sea of Japan, with aerial refueling, it could reach and loiter near the third island chain.
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Given the increasing rumors, I suspect the H-20 is a B-2-sized optionally-manned stealth bomber with a 6500km-7000km combat radius, featuring a cranked-kite configuration. While its stealth capabilities might be slightly inferior, it could carry longer missiles, including specially developed compact HGVs/HCMs with a 5000km range. Besides the mentioned Arctic route for striking the entire US (which relies on Russian cooperation, requires penetration of Canadian airspace, and is likely reserved for nuclear missions), a more conventional approach would involve aerial refueling over coastal areas before striking the US West Coast. This would serve to counterbalance the political and economic impact of the US and its allies targeting China's developed coastal cities.