If you're a Windows Insider who loves to test new features, you're going to have to wait a little while before any new features begin showing up in upcoming preview builds. Much like how Redstone 1 was developed, Microsoft has announced that they are focusing on under-the-hood changes first, adding new features later down the line.

This is the nature of development, so this shouldn't come as a surprise to Insiders. Upcoming preview builds from the Redstone 2 development branch will feature a lot of OneCore refactoring changes, and as such Microsoft warns these builds may be a little more buggy than usual. If you're not okay with this, you should switch to the Release Preview ring or leave the program entirely for now.

Not only that, but Microsoft will also be holding back Redstone 2 builds for Mobile at first, giving PC builds a head start for Insiders to test. Again, this is similar to what the company did with Redstone 1, so this shouldn't be all too surprising. Mobile preview builds for Redstone 2 will resume in a few weeks, but for now PC builds will be the focus.

From the Feedback Hub post:

We are now getting ready to start releasing new builds from our Development Branch to Windows Insiders in the Fast ring again. Just like we did after the release of the Windows 10 November Update – we will start off by releasing PC builds from our Development Branch first and then start releasing Mobile builds a few weeks after.

With the new builds we release from our Development Branch, you won't see any big noticeable changes or new features just yet. Just like just like we did after the release of the November Update, we are focusing on making some structural improvements to OneCore. If you recall – OneCore is the shared core of Windows across PC, tablet, phone, IoT, Hololens and Xbox. It is essentially the heart of Windows.

We're doing some code refactoring and other engineering work to make sure OneCore is optimally structured for teams to start checking in new features and improvements in a few months. As a result, these builds may include more bugs and other issues that could be slightly more painful for some people to live with. If this makes you uncomfortable, you can change your ring by going to Settings > Update & security > Windows Insider Program and moving to the Slow or Release Preview rings for more stable builds.

Microsoft is now ready to start releasing Redstone 2 builds to Insiders on PC. As we reported recently, Microsoft could get the first Redstone 2 build out to Insiders as early as this week, which we're super excited for. Let us know below if you'll be testing Redstone 2 builds!