After reading all the tweets and the comments devs are making, they are making WoD release way later than June or summer. Even when asked at Blizzcon, they said that their aim is before winter which means that it could be in autumn (as far as Sept or Oct).
Let's get realistic, even if beta was to launch today, there's no way they'd make a 3 month beta for an expansion (heck even raids need nearly 2 months to test them fully) so that makes WoD atleast to be launched in July if not August. And with the comments on class changes? Maybe September which concludes a full year of siege without any new PvE content or new content in general, leaving the ones not in the beta be completely bored and burned out.
Way further ahead in development than MoP? What a blatant lie... You people need to calm down pressing F5 all the time for beta/pre-orders since all what the devs are doing is just grabbing our attention and building hype for the game. So what do you think, will we face another full year without any new content?