Here is the article that confirms it:
http://www.massively.com/2008/07/17/kotor-mmo-confirmed-by-electronic-arts/
It might not necessarily have a monthly fee. More and more MMORPGs are coming out these days as free games, with either a tiered system, where you can play the game for free or pay $5 a month for some special benefits, or as a microtransaction system, where the game is free, but you can buy special game points with real money and then use those points to buy special in-game items, like uber potions and stuff like that.