I expect that they're regular transformers, and this year's Vector Prime will be a preview of what we can expect from the rest of the range. I.e., similar to how CW Buzzsaw featured TR gimmickry, Vector Prime should give us an idea if there will be any patterns to expect from the remaining 12 over the next couple years. If there are to be any unifying designs, decos, gimmicks, etc., Vector Prime will probably have them.
I still hope they can interact with the Prime Masters in some way. I'll at least interpret them as some sort of avatar at least. But if they can stow away in their bodies somewhere, maybe in a spark chamber, that would be fantastic.