ok me
thinner + lighter (=less batteries) + a processor almost 3 times the speed of last years A4 against similar battery performance is simply impossible.
It will feature a slightly faster cortex A8 probably at the rumored 1.2 GHz speed.
The dualcore A9 i think they'll save for a (september?) ipad HD.
Also just 512 MB RAM.
I also dont think the wi-fi only models will have a backside camera. The backside camera makes no sense when you dont have GPS and thus little use for augmented reality. This would also explain the conflicting reports regarding the backside cam.
Finally i do think there's a chance we get a slighly higher res screen at 960x1280. But only if retina is not around the corner.