Well, sorta. Only the 360 version will get this bad boy: Tomorrow, Thanksgiving, here in the US, 360 owners will be able to download an exclusive song to commemorate the special day. In this case, Its the Halo MJOLNIR Mix, from Halo 2. Y'know, the one by Steve Vai? So, look out if you're playing it on live, someone
may attempt to teabag you while yelling "Get raped you son of a bitch!"
Source:
http://news.teamxbox.com/xbox/15159/Guitar-Hero-III-Halo-Theme-to-Arrive-for-Free/#