http://wccftech.com/windows-10-redstone-4-17025/

Having released Windows 10 Fall Creators Update to the public last week, Microsoft’s Windows team is now ready to focus on the next version of its desktop operating system. Dubbed as Redstone 4, we have already received a handful of Preview Builds from the Redmond software maker. While earlier builds were only sent out to those who had opted for the new Skip Ahead branch of the Insider community, since the last Insider Preview Build, the Redstone 4 is available to both the Fast ring and the Skip Ahead insiders.

Here’s everything that is new with Windows 10 Redstone 4 Insider Preview Build 17025.