Battlefront 3 is tipped to be released in summer 2015, so you'll have some wait. Just admit it, if you're the type of person who comes to this forum, you'll be getting BF4.
I've played all the past BF's, BF2 I played to death but 3 not so much. Don't know why, maybe I'm getting too old for it. When I came away from playing I did used to feel exhausted so it was stressing me out I think lol.
I think with the little I played of 3 and 4 not looking much different really I can't see anything there to tempt me. I think GTA Online has more to offer me and keep me playing for quite a while.