Can we get an explination on new race/class?

We're making new character models for all original races (and likely draenei/blood elves as well) including redone hair/skin/appearance options and animations. We're essentially implementing 8 (10) "new" races, as far as the amount of work goes. It's been a long-time coming, it's been one of your guys' main requests for the game, one of our biggest wish-list items, and we're finally delivering on new character models. That's huge.

As far as a new class, when we take a long-term view of World of Warcraft we don't see a game where we ended up having 50 classes. A new class is a big deal, and while it can be a lot of fun, it's also a big shakeup to people's understanding of the game ("Who is this new guy and what does he do?" /in your best Arnold voice). Even if you don't play one they'll be in your groups and so it requires that everyone essentially learn the new class. We are intentionally cautious about adding new ones. Plus we just added monk and the class landscape right now feels pretty good. There will of course be class tweaks and changes in Warlords of Draenor, but having an expansion with the same talent system as the expansion before it (*gasp*), and with more or less the same ability/class lineup will be a nice change of pace and allow both our designers and players to focus on the big new features and quality of life improvements to the game's core systems.