Well, the very real possibility of that PSed satellite photo being meant for spoofing cannot be discounted. I would advise caution.
Still, taking a closer look at this PSed photo and making some rough measurements by taking the Y-20's wingspan at 50 meters, here are the results:
View attachment 161685
Provided that the overall configuration and dimension shown by the PSed photo are close to the real thing, then we can say this aircraft is likely slightly larger than the B-2, most likely with the same wing sweep angle as the B-2, and could fit IWB(s) with a maximum length of:
1. ~9 meters (if overall aircraft length is 3x IWB length, B-2-esque);
2. ~10.8 meters (if overall aircraft length is 2.5x IWB length); and
3. ~13.5 meters (if overall aircraft length is 2x IWB length, B-21-esque).
To be on the conservative/safer side, I'd settle with the first two options for the time being.
And once again, I would like to stress that please do take all the above information with a grain of salt for the time being.