I have that, and to speak frankly, I don't like it at all. It isn't a remake, it's a whole new story about earth being invaded by aliens. And it isn't even really turn-based; you order your soldiers what to do, and they do it. You can pause the time at will to give more orders. The Afterlight and Aftershock are too realtime, but from what I've heard, they're better than Aftermath.
I suggest you wait for UFO: Extraterrestials, which is an unofficial sequel to Enemy Unknown. And it is really turnbased!
See the Wikipedia article at
http://en.wikipedia.org/wiki/UFO:_Extraterrestrials