Wing geometry of one of the likely manned 6th gen prototypes caught by satellite matches. All the clear CGIs are based on the diamond winged tailless variable geometry airframe but a full scale prototype at an airfield next to hangars would suggest there's some basis to rumours of 6th gen being tailless at the very least.
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This is from like 2021, not new.
Its estimated size is 14m long and 12m in wingspan, and could be consistent with a demonstrator airframe or a prototype for a UCAV or both. It's a bit small for a proper next generation fighter like what we would expect for J-XD.
And yes from multiple angles taken at the time it's a delta, tailless, probably single engined. It was unclear at the time whether it was an actual flying airframe or a mockup.
We don't particularly need to bring up that 2021 tailless airframe as support for expecting the J-XD to have a good chance to be tailless. Other studies over recent years have also investigated various tailless airframe designs that would be consistent with research for a next generation fighter as well as new airframes in general.