Microsoft may push a new Windows 10 Mobile / PC Build to insiders in Fast Ring today. As per the teaser image posted by Dona Sarkar on Twitter, it may be the Build 14977.

But the Windows 10 Mobile Build 14977 has been also been spotted in a leaked screenshot posted by Necrosoft Core on Twitter. While Build 14981 screenshot was also posted by the same source earlier, it seems Build 14977 is the next for Fast Ring.