Build 15042 for PCs includes a new prompt to make it clear when Flash content has been blocked in Edge. There are a few updates to the Edge EPUB-book reading experience. And Microsoft has fixed the download-progress indicator with this build, which was broken in the past several Insider builds.
Build 15043 for Mobile includes a bunch of fixes to settings, Continuum, Mail, Calendar, Edge, and more.
Microsoft is expected to begin rolling out the Windows 10 Creators Update release in April 2017. A second Windows 10 feature release, codenamed Redstone 2, is due this fall, as officials disclosed last year.
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