NVIDIA has been sending out emails with a coupon code that provides access to The Division beta. The email says that quantities are limited, so you'll need to redeem your coupon quick if you got on that is.
The Division beta kicks off on January 28 for Xbox One users, while PC and PS4 users will have to wait 24 hours to jump in. The beta will run for three days, ending on January 31. As for the game, you're looking at requiring around 26GB of HDD space.