About PLAA's 5TH gen fighter,here i can tell ya:
1,named j-20,not j13 or J14..
2,the first Prototype Vehicle will flight in 2010
3,engine is WS-15 developed by xian redflag factory.
4,have two type 5TH gen flight,one(heavy) in chengdu 611,the other in shengyang 601.
BTW,aviationweek...