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According to several Twitter posts, Windows 9 build 6.4.9803 has recently been sent for testing purposes, but there are absolutely no details right now on what’s changed in this particular version.
Although a changelog is not available (it rarely is) this particular version of the operating system has reportedly been sent to partners for testing purposes.
Which means that details on this should follow soon, hopefully, along with screenshots that reveal some of the new features that are expected to be part of this next full version of Windows.