Note: Not official. Edit: Now official. Blog post.
News from Massively. They seem to have the scoop on an upcoming blog post detailing the changes for BWE3. Apparently Asura and Sylvari will be playable!
Assuming this is true, it's not surprising. These areas need to be mass beta tested. They also probably don't want a flood into these areas at launch at the expense of the others. Finally, they may want to wipe the characters and simulate a launch.