Why? You've no doubt played "real" X-COM already, it's been out for quite some time. Why not be excited for another game in the same universe with similar mechanics? I played an absurd amount of Enemy Unknown and loved every second of it, but I'm far more interested in a tactical third person shooter the likes of which we haven't seen since GRAW.
I want more real XCOM not this, hat is all. Enemy Within for me please!
Also I have not been impressed by what they have show of this game. Scenario alone will not get me to buy it.