Last year it was announced that the classic gaming channel G4 would be returning and now we know when. G4 will officially launch on November 16th 2021.
The channel will be available on TV via Verizon Fios, Xfinity TV and Cox.
Even if you don't have those services, the channel will also be streaming on Philo and their official Twitch channel. They also announced the first batch of programming with more being announced closer to launch. According to Blair Herter on Twitter, this isn't the final list yet of partners so more places to watch will be announced at a later date.
More information can be found in the official press release including full descriptions of all their programming.