Microsoft have released Windows 10 build 10240 to Windows Insiders on the fast and slow ring. This release is only available via Windows Update as Microsoft test out the Windows upgrade processes.
In the blog post Gabe Aul says that in the next two weeks there will be builds and app updates:
Besides builds, over the next 2 weeks you’ll also see some Windows Updates and app updates in the Store, so make sure to keep checking for updates daily to make sure you’re running the latest and greatest code.
I wonder if that means there will be more builds before July 29th? So go to settings, Update & Security, Windows Update and get downloading the new build!