In an interview at Comic-Con with writer/director Jeff Wadlow, Slashfilm of course asked about his current writing project, X-Force. The spin-off of the X-Men films has gotten a lot of attention for a movie that only has about a third of a first-draft script written, and a lot of speculation centers around the characters that will be included. According to Wadlow, that's part of the fun, and he hints that it will be some merger of the 90s line-up created and made popular by Rob Liefeld, and the modern line-up made popular by Rick Remender.
"Oh yeah. I love the current incarnation, UNCANNY X-FORCE. I love what Rob did in the nineties. I remember buying X-FORCE #1 and what I’ve really loved about the announcement that we are working on the movie is how excited people are by the potential, but also how curious they are like “What’s the line up?” What’s interesting with X-MEN, I mean they have an iconic lineup, so you know who is going to be in that movie, but X-FORCE it’s like “Who is it going to be?” I love that people are guessing."
Meanwhile, Fox's "X-Men Creative Guide" comic book writer Mark Millar hinted that there will be at least five core members to their line-up, adding "People are going to be dissecting every name as it gets released, so it’s will be so cool when you have your five."
X-Force creator Rob Liefeld has been active on twitter since meeding with Wadlow, but isn't letting too many hints through. He did say, however, not to think of "five" as "gospel," rather as a core group or a guideline.
For our money, Newsarama would love to see a mixture of characters like Cable, Deadpool, Psylocke, Shatterstar, and Fantomex (you know, if we had to throw five out there off the top of our heads) with X-23 as our #6 - a Wolverine-like character, but also another female. Several former New Mutants, Wolverine, the list to choose from goes on and on.