Wasn't the wording "PS3 is the only place you can play it when it launches in 2010?" It doesn't say anything about 2011.
I personally can't play another MMO. WoW and someday Star Wars is already way too much, so I don't really care - but why would any company do a console MMO and NOT put it on 360? You need such a big number of players to make it really worth doing, and it just seems financially stupid - even more than for a standard game.
Just curious.