Dubbed the J-20 the aircraft is quite large possibly being more akin to a fighter/bomber then a stand alone fighter.
It's large size allows undoubtedly for probably a very large internal payload of either weapons or fuel.
The J-20 bears resemblance to the MiG 1.44 and some aspects of the USAF F-22 & Russian PAK-FA.
It is likely the aircraft is being powered by the same engines used in the the Su-35, since China is still having
problems developing a indigenous reliable engine for its J-11(Su-27 Flanker) fleet. As more pictures come forward
and eventual footage of its first flight better ideas of the aircraft possible capabilities will be formulated.



The MiG 1.44

The F-22 Raptor

The Sukhoi PAK-FA

Here is my favorite photo

J-20 photos from Ares Defense Blog http://www.aviationweek.com/aw/blogs/defense/