There have already been rumors that Tom Hardy would have a small or even cameo role in Star Wars: Episode VIII, but new rumors suggest exactly what that role would be. Over at MakingStarWars, they have a report on not only the role he'll play, but how he'll be featured in the movie. Possible Spoilers from here on out.
According to their source, Tom Hardy will play a First Order stormtrooper, and one with a pivotal moment, similar to how Daniel Craig allegedly (it was never 100% confirmed by Disney/Lucasfilm) played the stormtrooper that Rey used a Jedi mind trick on in Star Wars: The Force Awakens. Hardy's stormtrooper sees Finn (aka FN-2187), and the two are old First Order academy buddies. The interesting note is that Hardy's character thinks Finn is on a mission to infiltrate and spy on the Resistance, not on a mission like that for the Resistance.
It'll be interesting to see if this is how it plays out; if nothing else, it's good to know Finn will be back on his feet and not just in a medbay for the whole film, right?
Star Wars: Episode VIII, written and directed by Rian Johnson, is filming now for a December 15, 2017 release.