As far as the enhanced ps3 trailors that is correct, a fine example of that is the trailer for Killzone, looks unbelievable in the trailer but thats because it was pre-rendered and it wont look half as nice on an actual ps3. From wut if found on backwards capability yes u will need the hdd, and as of right now i think it was been said that 20 major xbox 1 titles will be playable on xbox 360, that doesnt mean that future games that arent out yet for xbox 1 wont be released with a patch for the emulation.