While there are two official games coming based on the classic XCOM (or, really, X-Com) universe, there's another, less official one in the pipeline as well: PC indie strategy title Xenonauts.
Originally unveiled in 2010, and billed as a spiritual successor to the original X-Com game, it's just received a fairly substantial visual overhaul, which you can see in the shots in the gallery above. You'll also find some work-in-progress images of the game's user interface, a fetish I know many of you, like me, can't get enough of.
Xenonauts is currently in alpha. You can actually play it now, though, if you preorder, with more information at the game's official site.