3) A New Caliban
Caliban is arguably one of the breakout characters of Logan, and while Stephen Merchant brings plenty of humour to the role, he goes out on a very powerful note by sacrificing himself in a bid to help Wolverine. Despite that, Rice still manages to retrieve his charred remains and tells his subordinates to retrieve DNA samples from them so they can make use of his mutant tracking abilities.
Could this be leading to a return for the character down the line? Despite Rice’s demise, I’d say that’s highly likely, though I’d put money on us getting a much different version of Caliban when he does come back.
In the comics, the timid hero underwent some big changes (see above) after being transformed into one of Apocalypse’s Four Horsemen, so a cloned version used as a tracker dog of sorts by someone like Mister Sinister would make a whole lot of sense. It might even nicely tie into the events of Logan via a movie like X-Force.