A week after releasing Windows 10 Anniversary Update, Microsoft is already ready to unveil new features for its next major update dubbed Redstone 2. The Verge reports: The new update doesn't have any big new features for public testers yet, as Microsoft is in the early stages of making structural improvements to its OneCore shared code of Windows across PCs, tablets, phones, HoloLens, Xbox, and IoT. The first few builds available for testing "may include more bugs and other issues that could be slightly more painful for some people to live" according to Windows software engineer Dona Sarkar. Microsoft has released Windows 10 build 14901, and the company is testing out new notifications within File Explorer to provide tips on what's new in Windows 10. You can opt out of the notifications, and they're just a test for now.