According to Gamespy today:

According to a rumor news piece seen over on Ten Ton Hammer, it's very possible that LucasArts could be developing a casual Star Wars MMO game. The browser-based project is said to be the co-owned effort between the publisher and long-time affiliate, Sony Online Entertainment.

Ten Ton Hammer has learned from an inside source that Sony Online Entertainment has once again partnered up with LucasArts to do another Star Wars MMO. While we have not yet learned the title of the upcoming game, it sounds like SOE is planning to use the browser-based Free Realms engine to power the game, and the game's setting will be the Clone Wars.

Does this mean Star Wars mini-games within the game, like the holographic chess-like game as seen in A New Hope? Unknown, but it would be cool to hit up a cantina with some buds and sit down for a few mini games.

The article reiterates that this project won't clash with LucasArts' other Star Wars MMO -- The Old Republic. Instead, it's purported that the new casual title will most likely be based on the Clone Wars CGI franchise.