The Windows 10 Anniversary Update may have just been released, but Microsoft never rests: It's well into work on the next two major updates for Windows, code-named Redstone 2 and Redstone 3. (Redstone 1 was the code name for the Windows 10 Anniversary Update.) Why Redstone? In the popular game Minecraft, which Microsoft bought in May 2014, redstone is an ore you mine and then use as a power source.
Microsoft has stayed fairly mum about what will be in the Redstone 2 and 3 updates, but it has confirmed that neither will be available this year. In a Technet blog entry, senior product marketing manager Nathan Mercer writes, "Based on feedback from organizations moving to Windows 10, [the Anniversary Update] will be our last feature update for 2016, with two additional feature updates expected in 2017." Those "feature updates" are the Redstone ones.
The updates will be tested and delivered in the same way that the Windows 10 Anniversary Update was -- first to members of Microsoft's Insider Program via a series of public preview builds and then, when the updates are final, via Windows Update.