I'll start with the some bands that haven't quite reached widespread audiences.
Children of Nova, a band from San Diego, announced the release date of their LP, Impossible Landscape, to be on March 13, 2012.
Closure in Moscow, a progressive rock band from Australia, released a new single titled "The Impeccable Beast." Not sure on any dates for the full length yet, but I learned that they have a new drummer, Salvatore Aidone. Their first album, First temple, contained some fantastic drumming, so I'm interested to see what the new guy brings to the table.
Moving on to a band that everyone is familiar with, The Mars Volta will release their new album, Noctourniquet, on March 27th, 2012!! Once again, they have a new drummer, Deantoni Parks, who played with the Omar Rodriguez-Lopez Group. The Mars Volta have a nice track record when it comes to drummers (Jon Theodore and Thomas Pridgen), so I'm sure Parks will be another fine addition.
It's shaping up to be a historical year for music. Mark those dates on your calender and be ready to sprint to the record store...or click "purchase" on iTunes.