A huge 'meh' from me - plugging your computer into your HDTV is so much nicer and flexible. Same big screen, in many cases a gamepad is possible, but with mods and so many other features.
Why the hell do I have to have paid for Xbox Live Gold to use the 360's web browser/Youtube, especially as both of those things aren't as good as the ones on my laptop?
That is what MS and Sony are competing against.
Rumour is that both PS4 and 360 are being announced before E3, so E3 can be less about the reveal and more about the launch games.