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I can't believe no one has mentioned this (and that it's not front page news here) - apparently Sony is selling off (or has sold) the European rights to a lot of their games, and in the process, region locking the game.
Europeans on US servers will be grandfathered in, but no new ones can play, and those outside Europe that have been playing on EU servers are now out of luck.
R.I.P. City of Heroes and my 17 characters there