Microsoft said that the Insider Program for Windows 10 beta releases would continue after Windows 10's official launch, and today it made good on that promise with the release of the first post-launch preview.
Build 10525 is now available to fast track insiders. Opting in to the preview is done in the Update page of the settings tab; check a box and the system will start offering preview releases.
What's new in the new build? As ever, Microsoft isn't publishing an exhaustive list of fixes or known defects, but there's one notable inclusion that'll make many happy: title bars can now follow the theme color, instead of being fixed at white. If the "Show color on Start, taskbar, and action center" option is enabled (it's off by default) then title bars will pick up the color too.
As with other Insider builds, 10525 contains a number of bugs, often in surprising areas. Perhaps the biggest regression is that sharing mobile broadband connections doesn't work properly; client machines won't pick up an IP address. The Movies & TV app will also need to be updated.