Microsoft today released Windows 10 Insider Preview Build 10565 to Windows Insiders in the Fast ring. This build includes some new features and improvements. Also, Microsoft announced that this build and associated Language Packs won’t be available until later this week for Windows Insiders in Russia and Turkey.
This new build includes lots of new features including the new Skype messaging, calling and video experience, tab preview in Edge, ability to sync Favorites and Reading list items in Microsoft Edge and more.
Read about the new features here. Known issues and bug fixes here.