MS on "XBOne" nickname: If you can't beat it, buy it
A WHOIS search reveals that the domain is owned by Microsoft. Currently nothing is hosted there - it redirects to a Bing search for Xbone - but presumably Microsoft has bought it to prevent anybody else from using it.
On NeoGAF earlier this week, Major Nelson called the Xbone moniker disrespectful. "I dont like it...it disrespects the teams that have put in thousands of hours (already) into the development of the product. Sure, its cheeky but I dont care for it myself," he wrote.
Time will tell if the Xbone nickname endures for as long as CODBLOPS. Xbox One launches on November 22nd.