They didn't actually mention new classes for 3.0 just multiple new jobs. It's a bit of a distinction when you have both.

From: http://gamerescape.com/2014/10/21/fa...naoki-yoshida/

GE: In the Heavensward information, you indicated new “jobs” but not new “classes” – was that intentional?
Y: You have a good eye! I’m afraid we can’t really say at this point. That’s a wonderful question though.