[Source] According to website CVG, Blizzard Entertainment is currently working on the next expansion (number 5) after Mists of Pandaria while the next-next expansion (number 6) is already being pitched and planned. To add on, Blizzard COO Paul Sams claims to know what the team will be doing for not just these 2, but for “multiple expansions ahead”. Hit on the source for the full article. World of Warcraft: Mists of Pandaria is currently in the Closed Beta phase.
And I just read that the auto-attack function was restored, as Blizzard initially meant for the new class to be a button-mashing one. Guess someone hurt their fingers while doing that.