Windows 10 Pro Build 10525 x64 ISO Insider Preview

Windows Update TH2 Pro Build 10525 is the first build released since 10240 was shipped out in July.

The Insider Program is going to continue. People that have joined the preview program now have a new build of Windows 10 available to them.

What's new in Windows 10 Insider Preview build 10525 - DEVELOPING
Desktop

New color options - default color for Start, Acton Center, Taskbar, and Title bars and that you wanted to be able to change to reflect your preferences. This feature is now available (though still early) in build 10525 for you to try. This is off by default, but you can turn it on by toggling this (Settings > Personalization > Colors):

Edge

Base for Object RTC support

And further

Improved memory management -added a new concept in the Memory Manager called a compression store, which is an in-memory collection of compressed pages. This means that when Memory Manager feels memory pressure, it will compress unused pages instead of writing them to disk. This reduces the amount of memory used per process, allowing Windows 10 to maintain more applications in physical memory at a time. This also helps provide better responsiveness across Windows 10. The compression store lives in the System process’s working set. Since the system process holds the store in memory, its working set grows larger exactly when memory is being made available for other processes. This is visible in Task Manager and the reason the System process appears to be consuming more memory than previous releases.

We do have a few known issues with this build.

Part of the fun of being a Windows Insider is getting to tinker with prerelease software before the rest of the world, but you should be very aware as an Insider that prerelease software will come with bugs and things that are incomplete. Make sure you know and accept what you’re opting in to when you join the program, and of course make sure to back up all of your personal data before you begin.

Mobile hotspot doesn’t work in this build. When sharing the Internet from your device with mobile broadband using Mobile Hotspot, it will fail to get a valid IP address from your device and will show no internet access.
An update to Movies & TV application from the Store will be required to fix an issue with video playback.
Optional languages packs will not be available during the initial launch of this flight, it will be available later this week.
Disabled Non Supported Drivers

More info : http://blogs.windows.com/bloggingwindows/2015/08/18/announcing-windows-10-insider-preview-build-10525/

No new ISOs have been provided because it wants insiders to try out the upgrade path. (this what i do)

Fortunately, the ESD files that Microsoft uses to ship these new builds allow anyone to create new ISOs.