A part of me is admittedly skeptical. Even though it's an outline, it's pretty on the nose with what happened in the comics. He was even hired by Sinister. The only difference is no mention of the Marauders and Morlocks.
Again FOX films especially Gambit don't have enough cred for a release date to really have the weight on it's own for it to feel like it's coming out. I mean it can come out and be made in the time they said (just as New Mutants was which has it's first trailer out) but there still isn't the assurance of say an MCU date. Though if this date does keep this will come out the week after Sony's Silver and Black movie so any momentum that movie may generate will be cut down by Gambit. Still until we actually see information of Remy's movie actually being in production I'm still holding my breath on it considering how many delays it's been through.