Quote from a Blizz Employee (ignore all the panda/monk stuff xD) about cross-faction communication
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.
The original post
http://blue.mmo-champion.com/topic/2040 ... other-why/
Though this particular response was towards Pandaren specifically, if it was about the factions as a whole, their response would be no different im sure. It would "ultimately not lead to a good gameplay experience". Thats by the sounds of this quote the reason why they wont bend their ideas and preferences on this part of the game.
Strangely on this matter I tried scouring google for Cross-Faction Communications/Speech and i couldnt find any Blizz responses or statements on the matter o_O I found droves of people just about everywhere I looked that were in dis-favor of removing or creating options to the barrier.
Unrelated to cross-communication;
I really like the idea of cross-realm BoA's /drool I would loooooooove if they'd do that already... Make things so much easier on mah!