We missed this news on Thursday, but word of Planetside 2 and other SOE games region locking are making it to mainstream media, specifically PCGamer.com:
Sony Online Entertainment have announced that the running of many of their games is transferring to German publisher ProSiebenStat.1 Games Group in Europe. Games affected include EverQuest II, DC Universe Online, Star Wars: Clone Wars Adventures, Free Realms, and this year’s Planetside 2.
While SOE will continue to manage the European servers for their games, European players will no longer be able to play with friends in the US. The two providers will use separate account systems and virtual currencies, effectively splitting each game in two.