The information regarding pre-loading actually came from the official French page for The Division, explaining that the 48-hour pre-loading can commence on all platforms. That means that you can prepare yourself on January 26th for the Xbox One, and January 27th on the PS4 and the PC. You'll need at least 26.25GB of space on the PC.
The relatively closed beta test is available only to those that have pre-ordered The Division or those that have been explicitly invited, so not everyone will be able to join in on the fun. But remember that this is a beta test, and Ubisoft is intent on testing infrastructure of the underlying online aspect and to have people see what kind of other issues are in the game. They want to use the feedback we'll provide.
The beta test will end on January 31st for all platforms.