I bet it'll just be them saying "We're releasing Pokemon Gray, the expansion of B/W2!" which will undoubtedly have the fabled Zekrom, Reshiram, and Kyurem all come together (it doesn't make any sense for them to go halfway through with the fusion and just leave everyone hanging in regards to what Kyurem was before it split). It seems to be their pattern to do something along the lines of that, and while they have slightly deviated from their pattern as of B/W2, I don't think they'll neglect releasing a special edition (and I wouldn't be surprised if they decided to release Gray and Gray 2 at the same time, making up for the lack of a B/W expansion). It's only my theory, though.