Saying it doesn't feel like X-COM is a little disingenuous, as the turn sequence is more or less the same though it plays through at a much higher speed. (I'm pretty cool with that, the original could at times be excruciatingly slow.) Tactics are different, primarily as a result of changes to line of sight mechanics that result from the new cover system. Cover is no longer as be-all end-all because you can still get shot at in it, which makes the game surprisingly less(!) forgiving than X-COM. Your soldiers (and the aliens) aren't as derpy about shooting to compensate for their lower likelihood of surviving. I'll have to play more to figure out if the tradeoff balances.
In general I'm happy with what I see so far, considering the small scope of the demo. Didn't figure out the capture methods in the mission, it suggested there were some, but my only option was apparently shotgunning the Thin Man in the face from one square.