Windows 10 Mobile Build 15210 is now rolling to Windows Insiders in the Fast Ring. Microsoft has released the new update for Windows 10 Mobile Devices with improvements and bug fixes. Windows 10 Mobile Build 15208 is from feature2 branch and it does not contain a single new feature.
Microsoft has fixed an issue with the Glance screen where the time was not updating. The previous update has added a bug that was causing some Windows Phones to lose the text message backup, it has been fixed with this release.
As it is a preview build, it does come with some known issues. The copyright date is incorrect under Settings > System > About. It shows as 2016 when it should be 2017. Only 13 phone models are eligible for Windows 10 Mobile Build 15210. If you own a unsupported Windows Phone, you can read our guide to install the build on any phone.