Microsoft has released its latest Windows 10 Mobile Insider Preview, build 10586.107 to the Slow ring, just one day after it rolled out to devices on the Fast ring this week. The new build is the latest cumulative update for the Mobile SKU, but while it's light on new features, it does include a handful of bug fixes and improvements.
Along with a more rapid-release cadence for the Fast ring, Microsoft has also been narrowing down the gap between some of its Fast and Slow ring releases. Earlier this month, it rolled out Windows 10 Mobile Insider Preview build 10586.71 for the Fast ring, before it reached the Slow ring a few days later.
Along with its latest preview build, Microsoft also announced the introduction of a third option for Windows Insiders alongside the well-established Fast and Slow rings. The new 'Release Preview ring' will offer early access to updates for the Current Branch of Windows 10 development - you can find out more about this here.