Recently, Ubisoft Montreal has released a new patch. The patch is packed with tons of new features. There is one that is exclusive to PC - 4k textures that can be downloaded separately. As for updates available for every platform, there are plenty of them. The patch adds Survival Mode, a Permadeath option, and has a lot of fixes and improvements in various parts of the game (gameplay, UI, Lighting, AI, and so on). Click here to read about all the changes featured in the patch.
Here is a small trailer announcing a new gameplay mode, Survival Mode: