Yeah, ok GT5 will move systems alright, it's like MGS4 in that sense.
But generally, for almost all the genres you can already get amazing, high quality games, so it is unlikely that there are many prospective buyers out there who are waiting for the next great FPS etc. to buy a HD console.
A game I'm developing with some friends:
www.xnagg.com/zombieasteroids/publish.htm
It is largely a technical exercise but feedback is appreciated.







