So, it looks like G4 is returning in some form next year. There's a lot of references to running jokes from the network in that trailer, but so far no word of official involvement from any former talent or what form this will even take, whether it's a Youtube thing, its own site, a network again, etc.
Edit: It looks like Kevin Pereira is involved in some way and possibly tweeting Olivia Munn coming back aboard?
Also, Adam Sessler quote tweeted the videos saying it's a "curious turn of events." I don't know if he's involved in any way, but he did apparently leave his last company in March, which is curious timing.