It'll get to rock band eventually... well... i hope. ;)
If theres any band that deserves it they do... in fact... I think Muse deserves to have entire albums put onto GH/RB. Don't you wish developers could do that with other bands that have incredible albums? It'd be pretty sick to have somewhere around 200-300 different songs to choose from... rather than playing the 2-3 "hits" or whatever from each band.