WOW - No Hero Classes Via Updates : World of Warcraft General Discussions

Nethaera from Blizzard comments on the question, "Is there any possibility of more hero classes being announced for the upcoming expansion?"...

We are thinking at current that any future hero class additions will be made in expansions further along the line so that we can control just how many classes the game has and continue to work on attaining balance as we add them.

Thanks