Mists of Pandaria launched at midnight last night in the UK, adding the Pandaren race, starting areas and the Pandaren continent for level 90s, and the Monk class.
[youtube http://www.youtube.com/watch?v=vOeUvGrugbc]
New technology has also been introduced for this expansion, with cross-realm zones to allow sharing of low-population areas and the ability to play with friends from other realms, and the inclusion of multiple instances of overpopulated areas to reduce load.