Info gathered from:
The island northwest of Pandaria. - Forums - World of Warcraft
]http://www.wow pedia.org/Unnamed_island_north_of_Townlong_Steppes
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So, apparently, there is an island NW of Pandaria. According to speculation on the WoW Forums, it is the home to an upcoming troll raid, and perhaps a daily hub in an upcoming content patch.
From wowpedia: "An unnamed island north of Townlong Steppes is off of the northwestern coast of the Pandaria mainland. It is on Pandaria's in-game maps, but it has not yet been mentioned by official sources, and its name and purpose are unknown. It is currently blocked off by the mist and cannot be reached by any means."
The bolded part is kind of interesting. It is blocked off by mist, but we all know the fine folks over here at Ownedcore can get around that, right? If anyone feels up to the challenge, please do so! Would love to see what the island holds. Here's a picture of the structure that is on the island (accessed by Far Sight).
https://i.imgur.com/9hyFFl.jpg
Notice the instance portal 0.0