I’m really hoping that Rey being the focus of that movie is a bait and switch. The main novelization of TROS actually makes the case that the reason Jannah and Finn rebelled is because they were Force sensitive. I’d love it if the central plot of the next movie was Rey training both Finn and Jannah as students. It could be about how the two of them want to help as many ex-stormtroopers as possible, but that would take away from their Jedi duties elsewhere. Maybe the two of them also develop feelings for each other and we can finally answer the question of whether or not the latest generation of Jedi are allowed to form connections like in legends.