Yes right now
2k Games is working on and X-com sequal, but we have no Idea what form it will be in, and its very possible it will be a FPS, which will just make me want to off myself,
Extraterrestrials was closer to the X-com feel, but I didn't like the story,
UFO aftermath was pretty good,
so was aftershock and afterlight, unfortunently the missions became very tedious very fast, and I never found that with X-com.
EA games is ruining a new version of Syndicate as we speak, and there have been rumors that it is an FPS/MMORPG type version, and not an actual strategy game.
As for dungeon keeper, I liked it. but i wish there was more to the game, playing both sides, I actually liked Evil genius better, even though it was riddled with bugs.