Microsoft’s CEO Steve Ballmer is giving the official opening keynote address of this year’s Consumer Electronics Show in Las Vegas. The event is scheduled to start at 6:30pm PT/9:30pm ET today.

Microsoft already announced its plans to bring the next version of Windows to ARM and similar system on a chip (SoC) architectures earlier today, but we expect Ballmer to have a few more aces up his sleeve, though he will surely also delve into the ARM announcement in today’s keynote and maybe even showcase a bit of the Windows 8 user interface.

Besides talking about ARM and Windows 8, we will surely also hear more about Windows Phone and Windows 7 on tablets. It’s also been rumored that Microsoft could unveil a new TV set-top box today.

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