last link is to a state of game (starts in a minute) official stream where they're likely to make it official
It's official, but no release date or further details until E3 in 3 months time (June)
quote from polygon/stream
"It wasn’t an easy decision, but there are so many stories and so many experiences that we wanted to explore within the world of The Division that we felt a sequel was the best way to explore these things,” he said.
Mathias Karlson, the game director, added that “It’s an incredible opportunity to take all of that learning, all of that experience from what The Division is today and put it into a new game.”
Gerighty said more will be revealed at E3. Yannick Banchereau, the community manager for the game, said no other details, such as a launch date or other features, will be revealed until then