Surprising considering he's going to be in space for what we can only assume is a large portion of the film.
More likely, Ops been and come back from space between tf4 or tf5. It wouldn't surprise me at all if TLK were to let down the fans expecting a Prime in space adventure.
I agreed with you at first, given the way TF1-3 were handled with continuity. But given this new TCU, the new writers, "The Last Knight" reference from AOE, I think continuity won't be an issue with these films anymore.
I guess with all the money Prime's been making from these movies, he's hired a chauffeur. In all seriousness, though, it is exciting to see Prime on the road again.