Gambit is a fan favorite character and Disney will want to take advantage of that and maybe even have Tatum play the character in an ensemble X-Men film in the MCU.
With Channing Tatum’s interest, Disney may still want to keep him on board, but the film would probably undergo some changes.
Late last year Simon Kinberg said that like the rest of the X-Men movies, Fox was continuing to work on Gambit prior to the closure of the Disney deal.
I expect Gambit to show up eventually, but when, in what capacity and who will be playing him are unclear for now.