http://www.pcgamer.com/the-division-18-update-rolls-out-tomorrow-free-weekend-to-follow/

Ubisoft said last week that the 1.8 update to The Division would be out sometime this week. Now it's this week, and Ubisoft says that it will in fact be out tomorrow, and that a free weekend will kick off a couple of days later. 

The 1.8 update is the biggest free update to The Division yet, with two new modes—a 4v4 Team Deathmatch mode called Skirmish, and a PvE Horde mode called Resistance—a new PvE map expansion called West Side Piers, Rogue 2.0 in the Dark Zone, a new movement system, and more. The full patch notes provide a detailed breakdown of what's in store, or you can crash-course your way through it with this video.