The Alpha realms have gone down after 1 day of having the new Shadowmoon Valley and Tanaan Jungle Alpha build! Since then people have reportedly gotten beta invites that say the Warlords of Draenor beta will begin Friday, June 27, at 2:00 PM PDT.
At the same time a Community Manager has announced on the Hearthstone forums that the plan is to release Curse of Naxxrammas in july! Remember this can change as there are still a lot of things that need to be done for it.
Quote from: Blizzard
Just wanted to give everyone a head’s up that we are currently targeting to release Curse of Naxxramas during the month of July. Unfortunately, we still have a lot of implementing and bug fixing to get through, so please stay tuned!
With that said, we are also targeting to reveal pricing details regarding Curse of Naxxramas next week on July 1st, so please keep an eye out for that.