Wolverine 3 villains may be familiar faces
The Reavers are a group of cyborgs that aren't too fond of mutants and operate under the instructions of Donald Pierce - a former member of The Hellfire Club. In the comics, it's alleged that Pierce built the Reavers specifically for the elimination of mutants...as well as some races of humans.
Alternatively, there could be a connection to the post-credit scene of X-Men: Apocalypse, but we won't go into too much detail on that side of things just yet.