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During the surprise Microsoft press event at 1 PM PST at CES some managed to snap a picture of a machine that was demoing Windows on an ARM platform. Now no-one said out right that it was Windows 8 but apparently the version number that appears on the screen indicates that it is indeed some build of Windows 8 being run.
Windows 7 versioning numbers: 6.1.7600.
The numbers on the screen: 6.2.7867 hence the rumor of it being a Windows 8 build.