It's common for companies to register many sites in the months and sometimes even years leading to a major release if only to prevent grabbers from registering sites they have no intention to use and maybe even trying to tarnish the reputation of the product/company.
With the 720 i'd not sweat too much.. even with Sony's lukewarm presentation MS doesn't have to fear they'll lose the marketing race.
That will begin in earnest at E3 in the summer and only increase over the fall when they start to hit gaming and news sites en masse revealing "exclusive" information, making "unintentional" leaks through various means etc. culminating in huge release parties before Christmas.
Solid info will most likely be available after E3.. so far what we know are just appetizers.