It has been known for a very long time now that Deus: Ex Mankind Divided will be available for both Linux and Mac at some point after launch, but that was pretty much the extent of the information. While the Mac port is still slated for the rather ambiguous 'later this year' period, I do have some good news regarding the Linux version - its coming next Thursday, November 3rd!
As is tradition these days, the Linux and Mac versions aren't being made by the developers themselves, but rather by an outside party. In this case it is Feral Interactive, the folks behind the ports of Mad Max, Total War: Warhammer, XCOM 2, Tomb Raider, and the list goes on. In other words, Feral Interactive has a lot of experience porting games, so chances are high that the upcoming Linux version of Deus Ex: Mankind Divided will be of more than satisfactory quality.
And just in case you have absolutely no idea what Deus Ex: Mankind Divided is all about, here's one of the relatively recent story trailers that sets up the story, the setting, and pretty much everything you need to know in order to jump in and start smacking people across the chops. Anyway, enough rambling, here's the video: