I'm pretty sure I remember reading an article on Kotaku that said there would be no new Xbox in 2012 or 2013. I just tried searching for it and found a ton of articles that say there IS a new console coming out in 2013, but they're all dated back in January or earlier, so who knows.
Anyway, I doubt Harmonix would announce a new game for the NEXT line-up of consoles (especially considering Sony and Microsoft haven't officially announced their's yet) so I'm sure the next game would remain on this generation of consoles.
775 Tracks: RB + RB2 + LRB + AC/DC + GDRB + Blitz + 22 RBN + 423 DLC
My Rock Band 4 Ultimate Setlist:
http://bit.ly/l1Sqxe
My DLC: http://dlcquickplay.com/user/gm439
My GT: i K e v i n Y
Aly
Me and Cipher are pals
Jibs has an awesome taste in music
It is but hasn't been put to full use yet. It's supposedly to be like Xbox/PSN and will allow third-party developers to release content and patches/fixes for games. More than half of the launch titles for the WiiU will be 360/PS3 and 1-2 PC games that are coming out this year.
My DLC: http://dlcquickplay.com/user/gm439
My GT: i K e v i n Y
Aly
Me and Cipher are pals
Jibs has an awesome taste in music