Pandaren not talking to each other cross faction; a Moonglade for monks
We do understand that, by not allowing pandaren of the opposite faction to communicate with one another, there's a breakdown in the story there. But we feel strongly at this point that changing the precedent on cross-faction communication for one race only will ultimately not lead to a good gameplay experience. We're very excited to introduce a race that can be chosen by either faction, though we don't see our philosophy on cross-faction communication changing as a result of this.
This isn't very related, nor is it a way of properly compensating for that communication limitation, but one thing we'd like to do (we think is cool and warranted) is make a unique place in the world exclusive to monks -- think Moonglade for druids.
What I'm hearing from people is, that Garrosh's Horde is attacking even more Alliance territory and it's not fair. As a player of both factions at level 85 and employee at Blizzard, I just don't fully agree with that assessment. From our perspective, one faction will assault a cherished town of the other faction -- which is also home to a very powerful and honorable figure in Jaina. There's now a conflict presented in the story there to further unfold in the next expansion.