I don't know about RB, but you can play songs off an SD card in GH4/5.
Wait, three Assassin's Creed games, a God of War Collection, LBP for the PSP, and Braid on the PSN? Man, this is what no longer getting multiplatform news does to me... Anyway, decent-looking collection this week. In any case, I'm glad someone finally got smart and decided to start giving out WiiWare demos.