Amazon, Best Buy, GameStop and Walmart have all changed their release date for Guitar Hero: Metallica. They are now listing the Wii version with a March 29th, 2009 release. That would be the same date that the 360/PS3 versions are released. The only version still dated for May is the PS2 version.
This is in no way a confirmation of the Wii release date being pushed up, but it’s strange that all those retailers updated at the same time. Thanks to AZSapphire for the heads up!