I think the whole OS will have movies running in the background like trailers when you browse the shop and you can "skype" with friends while you play your games streamed to 2 or so tablets etc. I think all that stuff done at the same time needs some serious amount of ram.
BUT
What IF They make it 512 MB and have like 1.5gb left for Games just as another kind of copy protection???
I mean start with Games that need 1.5gb Ram and then 6months after release they make games require 1.6gb instead of 1.5 so people that modded their consoles and are stuck with 1.5gb for games have it harder to play those games because they can't get the newest firmware etc etc.
its a small obstacle that might be removed with updated custom firmware etc but who knows if custom firmware will be there at all.
just my 2 cents.
