A new insiders preview build has been aired by Microsoft. If you are running 64-bit version of Windows 10 in fast ring, check for Windows Update to get the new build 15042. Dona Sarkar in her blog post mentioned that, 32-bit version of Windows won't get this update due to a major bug.
As Microsoft is heading towards the final release, the build contains a bunch of changes, improvements and fixes. Read the known issues for PCs before installing this build.