For all we know, bacta is a healing substance in the Star Wars universe. Furthermore, it can inexplicably heal pretty much everything from broken bones to lost hands. You may recall that Luke Skywalker was dunked into a tank loaded with bacta after he got away from the swamp cave in The Empire Strikes Back, and he turned out fine and dandy. Well, almost.
4. Revelation By Rian Johnson
Rian Johnson, the director, revealed that the film will start right where The Force Awakens closes, denoting a first for the franchise. That implies Finn won’t not require all that much time to recoup. Furthermore, there is also a hypothesis that Finn is really the reincarnation of Anakin Skywalker. This further implies that he would be in store for a considerably more existential awakening.
We’ll need to wait until the film releases in December, 2017 to discover more.