Odd time to post...
For MoP, I think they have a bit over 300 dailies, and 40 (50?) are available each day. so you'll get a bit different quest each day. (but will still see some same quests).
From what i've seen, there are a lot of different types of dailies, although there still are a ton of the old 'kill this get that ' dailies. The mobs seem to have very varying abilities though.(Think of firelands dailies, the final quest where you fight 1 of 6 lieutenants)
For example, there's one where its actually like you're pvp'ing a mage :P