I had heard around 100 people, but I don't have a source to back it up. The game is still in "development mode", which means they probably haven't reduced staffing. They want to eventually be able to charge for the game, and they've had to rewrite major systems, do new artwork, design new classes; it's taking a lot of work.

I don't think they will reduce staff until after PS3 release and the start of the subscription fee, so perhaps after June 2012? I think June 2012 is dependent on whether or not they redo all of the zones, if not; they can probably do it a bit sooner. Hopefully in their pursuit of a strong mmo division, they will keep the team very strong beyond that point in the hopes of pumping out large amounts of content so that players are interested in the game.