While waiting for UFO2ET to be released...
There is Phoenix Point scheduled by the end of 2018. A game from the creator of the original X-Com, you can find articles on the web since their website is just the main page with info mailing list. (I guess we'll be able to play it before UFO2ET has been released)
https://www.rockpapershotgun.com/2016/0 ... an-gollop/
http://www.phoenixpoint.info/