The last two expansions were announced at Fanfests held towards the end of the year, including teaser trailers, with the expansions launching about six-eight months later, so it's highly likely we won't hear or see anything about it til the next Fanfest (which is in late October). I guess it's possible they may instead reveal something at E3 or the Tokyo Game Show, but I doubt it. So we have a few more months to go til we hear anything conclusive about it I'm afraid.