Alexander Dultsec's design renderings for Sukhoi's PAK FA program included a delta wing sixth generation looking design.

Dultec's Delta PAK FA @7

 My 5EZP Su-60 Delta PAK FA @7

 Design pattern on build table.

PAK FA D@5 inflight

PAK FA D @ 9

Link to maiden flight:

http://www.youtube.com/watch?v=PeYZh0qNsDI