Right from the very end of the first movie, Deadpool promised that Cable would be coming next. (superfans.website)
PHEVs showed up at the tail end of the first movie, and will be a part of the story of what happened since. (calcars.org)
Jack Black again does voice duty as Po, the less - than - agile panda who somehow became Dragon Warrior at the end of the first movie — also less than smart given that he's just twigged a crucial detail of his heredity. (independent.co.uk)