After several delays, The Division is heading toward beta testing, and you can get in on it. The first beta test will be on the Xbox One with a later test planned for all available platforms, and players have two ways to aim for a spot, either by signing up or pre-ordering the game.
Pre-orders get assured beta access to the game when the beta first goes live, while players who sign up to be on the waiting list may or may not be allowed in depending on whether more testers are needed and whether randomness favors you. A full FAQ explains how signing up for multiple platforms works and the process for going from the waiting list to definite access; check it out if you’re still lost.
Source: Beta signups, Beta FAQ