There have been many speculative images created as to what the PAK FA aircraft would look like, but that is NOT the Sukhoi T-50 that flew yesterday.
The T-50 has twin all flying vertical stabilizers (no rudder,) and the engines are widely separated like on the Su-27/30. The T-50 also has a more delta shaped wing, not diamond-like as in this image.
Sukhoi T-50:
