I think the reason they only raised the cap by 5 levels was to increase the number of expansions they can have, and to make their content last a bit longer.

I hope we get another hero class, as that was their design choice from Wrath, alternating new races with new classes. I think it would be kinda cool if pandaren were a neutral race, with their own starting area at level 75 or something, and you make choices during your leveling process and at the end you pick a faction to join.