I was recently able to get a few details clarified about Finn in Episode VIII. I have seen a lot of people debating online about who else might wield a lightsaber other than the characters we already know have them at the end of The Force Awakens.
One thing I can say for sure is Flux is not aware of any scene where the Finn character uses a lightsaber again. General Flux has only seen the blue Skywalker lightsaber that Rey used, Kylo’s crossguard and Luke Skywalker’s green lightsaber he used in Return of The Jedi. All of these were made as both hilt and stunt props with blades and remotely controlled light effects in them. To Flux’s knowledge, Finn only uses blasters and thermal detonators this time around.
Also, Finn’s role in the third act of the story will involve he and Poe working together. Apparently, Poe and Finn will have different tasks early on in the film but we will see them in action together again by the end of Episode VIII. GF also told me with confidence that Phasma and Hux are very much involved in thwarting Finn and Poe’s third act heroics.