As reported yesterday at blabbermouth.net, Dream Theater are indeed hard at work on their new album, set for release later this year. 
While the band still has yet to reveal their new drummer, guitarist John Petrucci checked in from Twitter to offer the following update: ""First day in studio and the dawn of a new era for DT. Can't wait to get the music flowing."
Dream Theater are set to co-headline this summer's High Voltage Festival in London alongside metal legends Judas Priest. The festival takes place July 23rd - 24th in Victoria Park. For more information go right here.
The band will be announcing a new drummer soon. Watch this space for more updates.