This leads me to speculate that the pre-expansion patch will go live the week after Gamescom, so the week of Aug. 19. That Tuesday will be the 21st, which fits in with the general one-month-before-expansion launch window of BC and Wrath. It also makes sense because it gives them time to debut the cinematic at Gamescom and then patch it to use the following week. Of course, I'm just speculating, and am keen to hear your thoughts. Whenever we get the patch, it'll be a pretty big game changer as new talents and abilities, a fourth druid spec, and new stat caps as well as several changes to how established talents and abilities work (and some being gone entirely) and active mitigation tanking.
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!