Thrall is technically still debating what the best course of action is. The conversation you can see in Grommash Hold, where he announces his decision to go to Nagrand and see what's up with all those elementals is actually the conclusion of the storyline so far. It's not like he is having the same conversation 20 times a day. Plus, having the leader of the entire Horde simply walk into Nagrand is no easy thing - preparations must be made, arrangements must be... arranged?
Thrall can just get port to Shat and take the flight path to Nagrand? Didn't know it was so hard.
The PTR seems to be ahead of Live (and rightfully so) so I got to preview some of the advanced phases and yeah, there is doom and gloom coming--fo' sho'!