And if you don't have the chance to test the bosses yourself today (maybe because you find heroic difficulty daunting or your guildmates are all at work), check out the stream embed above. It's from the perspective of Kennyloggins, a hunter in the guild Midwinter of Ysera (US). The guild also has a team page if you're interested in seeing the fight from the perspective of other classes.
A little Shadowfiend also told me the guild is planning on giving away some prizes on behalf of its sponsor, once testing on Tsulong is complete.
For those of you interested in 25-man raid testing, a blue post from Watcher late last week said it would begin after 10-man heroic testing is finished. Following today's testing, there are six more bosses left on 10-man that could possibly be tested.
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!