Microsoft rolled out Windows 10 Insider Preview build 17017 to Fast ring users just a few hours ago, however, many are facing problems updating their devices. Microsoft is now working on a fix.
Build 17017 RSS
Microsoft released Windows 10 build 17017 to the Fast ring today, the first Redstone 4 preview to be offered to all Fast ring users. As you'd expect, there are a bunch of fixes, and some known issues.
Today, Microsoft released the first Redstone 4 Insider Preview for those in the Fast ring and didn't choose the Skip Ahead option when it was available. Here's what's new in build 17017.