New Builds of Windows 10 delivered to Fast Ring subscribers don’t usually get ISO releases, but Build 10565 is a bit different.
The ISO downloads are available here: Download Windows 10 Insider Preview ISO
According to VP of the Engineering Systems team and Ring Master at Microsoft, Gabe Aul, the out of the ordinary ISO delivery is to help test new activation paths.
Windows 10 Build 10565 contains improvements to the Start Menu, Cortana, and integrated apps. Rich has the full spectrum showcased in Hands on with Windows 10 Build 10565: What's new and improved. Additionally, if you’re attempting to install Build 10565 to a small screen device, check out: How-to install Windows 10 Build 10565 on small form factor devices.