Since the launch of Windows 8, the string of leaks of Windows builds has all but come to a halt. While we have been hearing quite a bit about Windows Blue, the images you see above are supposedly from the M1 of Windows 9 (unconfirmed). As noted by the post on MicrosoftPortal.net, the M1 build kernel has been given a bump to 6.3 (Windows 8 uses kernel 6.2). In addition, the images are supposedly from Windows 9 build 9319; Windows 8 was build 9200.
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Windows build 9319 spotted in the wild, kernel gets bumped to 6.3 - Neowin