Well we were warned. Microsoft has released a new Windows 10 Insider build for Redstone 5, which has now moved from Skip Ahead to the Fast Ring. Build 17661 adds a bunch of stuff, including updates to Sets, more Fluent design, a new name for Windows Defender Security Center (now Windows Security), and a lot more.
We’ll have all the details up in just a few minutes but for now get to downloading!
Further reading: build 17661, Fast Ring, Skip Ahead Ring, Windows 10, Windows Insider