The ESRB ratings website is a veritable treasure trove of nuclear launch codes, CIA secrets, and unannounced Virtual Console games. Recently, ratings have popped up for Mighty Bomb Jack, and Romance of the Three Kingdoms IV: Wall of Fire. While not all of the ESRB rated games have yet arrived on the console, it's fairly certain that they'll get here eventually.
In addition, Super Ghouls n' Ghosts was announced not only for the Wii, but for the 360 and PS3. This would make it the first game to be released on all three systems' classic download services, which then brings up silly flame wars and pointless arguing.
But seriously, the Wii version will totally be the best.
(Note: The GameSpot article mentions that Galaga was also tagged for release, but we actually caught this back in January. We rock.)