I don't believe they'd make this big a change and not announce it beforehand, even if it's only hinted about (like this new bond system). I mean, if the trailer said something like "Expect changes in new and old Pokemon in this Gen", I could believe a new type coming, but as everyone knows, this was not the case.
So, I'm not voting, as I don't think they'll be adding a new type this Gen.
Played: Pokemon Black (and White). Progress: Finished both, with complete Pokedex in Black. Playing: Pokemon Conquest. Progress: At the post-game.