Bretonians are next according to this bit. In fact, the source is claiming it to be 100% next, although for obvious reasons I can't relay those. They do however sound solid.
Please remember this is still a rumor. In this instance I had to remove a lot of the verification info on the rumor that gave it the credibility. The meat of it all though is that Bretonnians are next.
via an anonymous source on Faeit 212
Bret's are 100% confirmed next