Probably the Mario movie that Illumination (Despicable Me, Secret Life of Pets, Sing) are making. though it's not releasing until 2022. There are alot of videogame based movies releasing over the next few years before Mario, but I'm expecting most of them to be bad. Monster Hunter movie sounds terrible.
I'd be down for that Dwayne Johnson as Knuckles.
I said live-action movie, so we can't quite count the Illumination Mario movie.
The only live-action game based movie in the next few years that I have high hopes for are Tomb Raider 2 and Detective Pikachu 2. Both Detective Pikachu and the Tomb Raider movie reboot were pretty good. As for the rest, I don't have high hopes for them. The plot leaks for Monster Hunter and Borderlands sound terrible, neither is following the games very closely. Uncharted movie has been through 6 directors which can't be a good sign, and it is following a young Nathan Drake played by Tom Holland, instead of giving the fans what they want, an older Nathan Drake played by Nathan Fillion. The CoD movie got put on hold recently while they look for a new writer I think. A Metal Gear movie was announced back in 2015 but nothing ever came of it, not sure if it is still planned or nor. I haven't heard enough about the 2021 Mortal Kombat movie reboot to judge it though, hopefully it is better than the original, which is one of the lowest reviewed game video game movies ever.
There are rumors that Sega is considering a whole cinematic universe based on Sonic's success, with Streets of Rage, Shinobi, Altered Beast, and Golden Axe movies announced alongside Sonic back in 2016. A recent leak suggested that those movies would be greenlit if Sonic was a success, and it seems like Sonic is a success. I will definitely watch those Sega movies if they happen.