I wouldn't expect the yoda species to be playable...ever. George Lucas, himself, put the kibosh on that, along with wookiee jedi.
Thats true, but people can change their opinions, and also he retired from SW I believe, and the yoda secret reveal in swtor would be epic. Yoda race, and open world pvp with player housing! Then everyone plays swtor - and is the #1 MMO.