Microsoft obtains 'Xbox 8' domain names
Microsoft was likely most interested in regaining these just to protect its own IPs – and the immediate use of things like xboxlivetv.com and xboxphone.com seem apparent.
It's tempting to suspect Microsoft is eyeing "Xbox 8" as the next console name due to the two domains that reference it; however, Microsoft already began integrating Xbox Live, and the "Xbox" name, into all its consumer products, including Windows 8. Also, it would be really weird if a domain squatter guessed the name.