Geoff's at it again giving us Video Game Christmas in December instead of in the Summer like E3 usually is. The Game Awards is a show about video games that has several nominated categories for various different achievements, but also hosts several first time reveals and new game information. The winners of the awards are voted on by a board of popular or big members of the gaming community, usually CEOs or popular figures. You can learn more about the game awards by visiting the website.
You can watch from one of the links in Geoff's tweet: