screenshot from Blizzard shows a pandaren-looking building on top of what looks like some mountain. There's snow falling (not exactly visible on the small version of the image; check out the larger version to see it clearly).
This looks like it's the Shado-pan Monastery in Kun-Lai Summit. (Thanks to a couple people for pointing this out.) It serves as the training grounds for the
Some people have noted that a small version of this image appeared in a Ghostcrawler postmortem, but we haven't seen a large version yet.
The dungeon preview video and more information about Kun-Lai Summit, after the break.