Just yesterday, Microsoft released Windows 10 build 10586.338 for Release Preview ring insiders but there was no change log. Here is the change log for this build.
Tag: Windows 10 build 10586.338
Windows 10 PC build 10586.338 is out for Release Preview ring
Microsoft has released the Windows 10 PC build 10586.338 for participants of the Windows Insider program. If you have joined the Release Preview ring, the update will arrive to your PC very soon.