Microsoft has registered a whole slew of "Halo: Infinity" domains from MarkMonitor, an internet brand protection company, including HaloInfinity.net and HaloInfinityMultiplayer.com. Infinity was a popular canyon-shaped multiplayer map that was only released for Halo: Combat Evolved on the PC.
As several of the registered domain names include something about multiplayer, like HaloInfinityMultiplayer.net and HaloInfinityMultiplayer.org, this could mean that the Infinity map may be coming to Halo: Combat Evolved Anniversary.
MS also registered domains like SpartanOps.org, SpartanOps.net, and MorethanJustamap.com which throws a whole wrench in to the initial Infinity theory. However, the UNSC Infinity is also one of the human ship's in the Halo: Reclaimer trilogy. So perhaps this could have nothing to do with Halo: Combat Evolved Anniversary, but rather something to do with Halo 4.
Whatever Microsoft is planning, Game Informer has a 14-page Halo 4 spread in their May issue (that's their cover art above), so I'm sure we'll hear more news on the plans soon. In the meantime, what do you think of MS registered all of these Halo-esque domains? Let us know in the comments section.