Microsoft made available the first of its Windows 10 "Redstone 2" preview builds -- No. 14901 -- available to PC testers on the Fast Ring on August 11.
As officials noted earlier this week, the first few Redstone 2 builds are primarily about under-the-cover work, not brand-new features. As it did with Redstone 1, a k a the Windows 10 Anniversary Update, Microsoft plans to make some OneCore common-core tweaks the priority for the first few Insider test builds with Redstone 2.
The only "new feature" in the first build of Redstone 2 is new notifications in File Explorer, which are meant to provide users with information about things they can try in Windows 10.
Today's build also removes support for kernel debugging and still has problems with Adobe Acrobat Reader, according to an August 11 blog post by Windows Insider chief Dona Sarkar.
Sarkar's post acknowledges again that Microsoft still has not released the "RTM" version of Windows 10 Mobile Anniversary Update to users.The team is "almost ready" to deliver the RTM (release to mainstream) version of Windows 10 Mobile Anniversary to those with compatible phones, Sarkar said today.
Microsoft officials also said earlier this week that Windows 10 Redstone 2 testers would get new test builds for PCs a few weeks ahead of when those builds would start coming to Windows 10 Mobile users.
Microsoft officials acknowledged earlier this week that the next "feature upgrade" to Windows 10 -- a k a "Redstone 2" -- would not be available until some time in 2017, which is what sources have been telling me for the last few months. "Redstone 3" also is expected to be a 2017 deliverable.