The second build for Microsoft's next major update to Windows 10, codenamed, Redstone 3, build 16176 was released today. Similar to the first release, there is not much to see yet; the platform is being setup for the new features to show up. For now, enthusiast can upgrade if they are interested and play with it. Here are some additional details:

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Today we are excited to be releasing Windows 10 Insider Preview Build 16176 for PC to Windows Insiders in the Fast ring. We’re continuing work to refine OneCore with some code refactoring so that teams can start checking in new code. So, you still won’t see any noticeable changes or new features in new builds just yet. Source

The Windows Blog notes one feature improvement in the latest RS3 build though, but this is more of interest to users utilizing the Windows 10 Subsystem for Linux.
 

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Windows Subsystem for Linux Gains Serial Device Support: Windows COM ports can now be accessed directly from a WSL process!

More information can be found on the WSL Blog.  Additional features and fixes are posted on the WSL Release Notes page – keep the feedback coming! Source

 

Windows 10 Mobile devices also received an update. The device support list for the Creators Update in particular has been shortened.

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We are also releasing Windows 10 Mobile Insider Preview Build 15204 to Insiders in the Fast ring. As we release new builds from our Development Branch for PC, we will also be doing the same for Windows 10 Mobile just like we have been in the past. However, Windows Insiders will likely notice some minor differences. The biggest difference being that the build number and branch won’t match the builds we will be releasing for PC. This is a result of more work we’re doing to converge code into OneCore – the heart of Windows across PC, tablet, phone, IoT, HoloLens, Xbox and more as we continue to develop new improvements for Windows 10 Mobile and our enterprise customers.

Starting with the Windows 10 Creators Update, these are the Windows 10 Mobile devices we will officially support in the Windows Insider Program going forward:

• HP Elite x3
• Microsoft Lumia 550
• Microsoft Lumia 640/640XL
• Microsoft Lumia 650
• Microsoft Lumia 950/950 XL
• Alcatel IDOL 4S
• Alcatel OneTouch Fierce XL
• SoftBank 503LV
• VAIO Phone Biz
• MouseComputer MADOSMA Q601
• Trinity NuAns NEO

Devices not on this list will not officially receive the Windows 10 Creators Update nor will they receive any future builds from our Development Branch that we release as part of the Windows Insider Program. However, Windows Insiders who have devices not on this list can still keep these devices on the Windows 10 Creators Update at their own risk knowing that it’s unsupported. Source

 

Its all relative though. Apple's iOS 10 for instance supports only seven models of iPhone; six if you take into account iOS 10.2's requirement for a 64 bit device. As for Redstone 3, I recently installed the first build, as expected, there really isn't anything new; it's basically the Creators Update at this point. Going forward, I might just limit it to a partition on one of my devices and occasionally install builds. These updates take bandwidth, which I have very little of, so, I would rather spend that 4 GBs downloading cumulative updates and app updates for commercial releases and my other devices.