The most promising news I've heard so far for Battlefront 3. Lucas Arts has licensed the Unreal 3 engine. There's actually a number of stories about it:
http://www.google.com/search?btnG=1&...nreal+3+engine
And if you're interested in a pretty good theory... listen to this guy.
http://www.youtube.com/watch?v=ZDBpIRXB4aE
I know it's not confirmation of SWBF3.... but it ranks up there for something beyond the speculation.