At the time of writing, and subject to rapid change, there are three Gold runs on the WoWProgress leaderboard, two of which are in Gate of the Setting Sun, one from Organised Confusion of EU-Anetheron-H, who currently hold the top time at 11 minutes 58 seconds, and one from Aquila of EU-Stormreaver-H who come in at 12 minutes 24 seconds. The only other Gold time is from Scarlet Halls, where aLions of EU-Senjin-A have a time of 12 minutes 49 seconds.
It's not surprising, with the head-start we've had, that the current Gold medals are mostly coming out of the EU. This will change very soon, and we can already see US groups coming up in the Silver medal sections.
It's open warfare between Alliance and Horde in Mists of Pandaria, World of Warcraft's next expansion. Jump into five new levels with new talents and class mechanics, try the new monk class, and create a pandaren character to ally with either Horde or Alliance. Look for expansion basics in our Mists FAQ, or dig into our spring press event coverage for more details!