While Microsoft keynote at CES is nearing, more leaks about announcements to be made have started flowing in. While Nokia 900 on AT&T is pretty much confirmed, Microsoft may demo Windows 8 beta at CES running on various partner PC’s. We have seen lots of demo of Windows 8 developer preview and some screenshots of Windows 8 beta in the past. The above screenshots seems to be from Windows 8 beta showing File explorer, Mail client and Messenger client. See more such pics at source links.
Update: Looks like these are just concept arts and not the original screenshots. Check comments section for more links on it.