I can see so many F-22 v.s. T-50 v.s. J-20 threads in my head right now, it's almost nuts.
Anyways, I didn't bother reading the 22 pages here as I've read at least 50 on various other forums and they're all saying the same bullocksy things, so, I'm quite confident to theorize that the J-20 will have a similar design philosophy in that it follows a similar usage philosophy of being a compromise of Stealth and Kinetics, where it's job would be to Fly damn close to another 5th Generation fighter and use it's kinetic superiority to it's advantage.
Two questions, and yes, I do know that you're probably going to say, "It's too early in development, it'll all be guesses!", but can any learned man guesstimate the J-20's: 1. RCS (either Frontal or all aspect will be fine) to an X band radar and 2. it's IR signature?