Kingdom Hearts - Big Hero 6 confirmed for Kingdom Hearts 3

Only the original's body. For all intents and purposes, the "original" Baymax lives on in the memory chip he left behind.

While I’ll give Square credit for doing this (since its quite original), I will say that I’m kinda disappointed that this means that were not going to fight Yokai and his Microbots. Mostly because I was hoping to see Square trying to duplicate the intricate animation of the Microbots, and also because Yokai is a pretty damn cool design for an enemy (plus having his voice actor to reprise his role would have been great).
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But hey, at least this looks promising enough!