Even if these are early PAK-FA (T-50) "might-look-like" from Paralay and co. they might represent something realistic ..
via
Deino
Some of those pictures aren't showing for me in that thread, but here're the ones that are:
I will not be dissapointed at all if SAC's 5th gen looks something like that. But smells too much of T-50 for me to take it seriously