According to the May issue of game mag Game Informer, rumour has it that The Beatles: Rock Band will support vocal harmonising. Makes sense! The Beatles music features vocal harmonising.
The publications gossip section rumourmongers that the game even makes it possible for multiple singers to belt out Beatles tunes, each with different mics. If true, this would obviously mean more armchair rock stars could sing at once, which could be a very good thing or a very, very bad thing.
When contacted about this, a Rock Band spokesperson replied, "We do not comment on rumours."