It should be interesting to see how Paragon does as a 10 man in Mists of Pandaria. Some guilds thrive after the switch, others rebuild and re-enter 25 mans. I personally can't help but think this is a symptom of the gradual erosion of 25 man raiding, myself, but we'll see.
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!