Yesterday (June 29,2015) Microsoft released new build version (10158) for windows 10 insider preview (for PC’s) which bring lot of new features ,improvements and bug fixes.One of the main feature is Microsoft Edge browser.
what is included/updated in this build ?
Microsoft Edge
General UX improvements and refinement
Updates to Cortana
Cortana integration with Office 365
updated Photos app for Windows 10
Snipping Tool
Insider Hub
Preview releases of Windows 10 SDK
Surface 3
Surface Pro 3
This update is available via fast ring but if you wanted to do clean install ,you may have to wait for couple of days until Microsoft release the ISO builds .
To know more about these features and improvements ,read http://blogs.windows.com/bloggingwindows/2015/06/29/announcing-windows-10-insider-preview-build-10158-for-pcs/