True, mobile previewer is not even close to what we see on the ipad, and forces us to be constatly uploading to the ipad to check if everything is ok... It slows down both our quality control and our efficiency...
Not sure why as we go forward in time we start to lose vital features like AA...
Some time ago I released the application Epic Zenta. /UDK Jan/
I also did not succeed AA.
I tried all methods /Postprocess,.ini files......on iPad2,iPhone4s/
But Epic Citadel has AA turned on !?
I haven't tested this myself yet but the answer I got from dev is that mobile AA is not compatible with the graphics effects (shadows, depth-of-field, god rays, etc). God ray is the only graphic effect I have on my mobile scene so I will test with that disabled.