I'm going to guess they're interested in making something called Halo Infinity.
Source: http://fusible.com/2012/04/microsof...registers-slew-of-halo-infinity-domain-names/Fusible said:Microsoft has made some interesting domain name registrations this week, picking up several “Halo Infinity” domains like HaloInfinity.net (Whois) and HaloInfinityMultiplayer.com (Whois) through the internet brand protection company MarkMonitor.
Microsoft didn’t stop there either.
Additional domain names that were registered include: HaloInfinity.org, HaloInfinity.co.uk, HaloInfinity.mobi, HaloInfinity.de, HaloInfinityMultiplayer.net, HaloInfinityMultiplayer.org, HaloInfinityMultiplayer.co.uk, HaloInfinityMultiplayer.mobi and HaloInfinityMultiplayer.de.
Infinity was a popular multiplayer level exclusive only to the PC for Halo: Combat Evolved, so it’s possible Microsoft will be offering it as a multiplayer map for Halo: Combat Evolved Anniversary.
Other domains that were registered the same week through MarkMonitor include SpartanOps.org (Whois), SpartanOps.net, and MorethanJustamap.com (Whois). These too, were privately registered.