A new build, cumulative update 10586.338 is around the corner. Microsoft is testing new cumulative build for Windows 10 Mobile for those who can not update to Redstone branch.
Russian hacker Roman has posted some screenshots of the upcoming build. This build should bring performance improvements, enhanced battery life and bug fixes only.
Cumulative updates are mainly aimed to optimise the performance and stability and you should not expect any new features with this build.