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I haven't even heard them acknowledge a new game, never mind telling us anything about it. Regardless, their current track record suggests that gimmick characters from previous games (aka the ones you mentioned) will have nothing or almost nothing special to do in the new one.
I've heard that they may announce the new game tomorrow, while a supposed info leak suggests the next game will be called Skylanders Superchargers (which does suggest a racing aspect). I think it's still speculation at this moment.