Ubisoft has only announced the game through a press release currently, with a full reveal coming at E3.
You can read the press release here:
We are very pleased to announce that we are currently working on Tom Clancy's The Division 2 . The development is led by Massive Entertainment and driven by close collaboration with Ubisoft Annecy, Redstorm, Reflections, Ubisoft Bucharest and Ubisoft Shanghai. The Division 2 will be based on an updated version of the Snowdrop Enginethat will help us realize our ambitions for this title. More importantly, we can also invest all the experience we've accumulated over the past two years in this sequel to make sure everything is going well.
But that is not all. The division continues. After the celebrations of our 2 year anniversary, we will support the game with 2 more title updates. These will be 2 brand new Global Events; Include more Legendary difficulty missions and an Xbox One X update that will rediscover the beautiful and emblematic New York City with all its stunning details in both 4K and 1080p.
In addition, as of June 2018, players will also be able to play 'Crests', which are specific achievements that will allow them to unlock The Division 2 rewards.
The teams are extremely grateful for all the support over the past two years and we can not wait to show you what we have planned for The Division 2 during the E3 2018 in June.