While I haven't preordered the One yet I will most certainly do so when I'm back in Germany!
I actually live in the Netherlands, but I have to finish school in Germany.
My reasons:
Microsoft has never failed to entertain me with Xbox.
The 2013/14 titles/exclusives of the Xbox One are the most appealing IMO.
I love the hardware and the idea of the Xbox One, especially Kinect, instant switching/Snap, apps etc. and especially especially the controller :D
And of course the social factor (friends) and the online experience. With 300.000+ servers I believe the online experience of the One will be unmatched.
Last but not least (not at all): HALO!!!