Today, Microsoft released build 10166 for Windows 10 Mobile to those on the Insider program. The release brings the mobile version up to date with the desktop release, marking the first time both operating systems are lined up.
In terms of raw features, there is not a whole lot new. After all, at this stage Windows 10 Mobile is mostly feature locked. There is the new larger sized (or just ‘normal’) battery icon and a lot more polish to the UI and core apps like the Store, which is now out of beta.