Lord of the Rings Online in Europe. At that time, Turbine will merge its US and EU branches into one "mega-service" called LOTRO Global Service. Turbine expects there to be a bit of downtime for the game during this transition and will offer exact details on that at a later date. Additionally, EU players will need to migrate their account on over to the new service -- exact details on how to do so are forthcoming.
Turbine has published a pretty extensive FAQ on how this will all go down, so if you're currently using the Codemasters Online service in Europe, you'll definitely want to head on over and give it a read. Full press release is just past the jump.