Microsoft has changed the format of the names it uses in Insider Rings in Windows. The new names reflect the quality of the builds instead of the traffic frequency.
According to the official announcement
We are changing and transforming the current Rings model, which was based on release frequency, to a new channel model that will be based on release quality and better support parallel efforts codifications. In addition to this change, Insiders will find similar names in Windows and Office developers, and soon Microsoft Edge and Microsoft Teams. Our goal is not only to make it clearer for existing Insiders to choose the experience that's right for them, but also for new Insiders to choose the right channel when they join.
So later this month, the Fast ring will become the Dev Channel, the Slow ring will become the Beta Channel, and the Release Preview ring will become the Release Preview Channel. The new name scheme is reminiscent of the format used by Microsoft to develop the Edge browser.
Insiders on the Dev channel they will download builds early in the development cycle that will contain the latest code which is under development by our engineers. These versions will not map to a specific version of Windows 10.
The Beta channel will be ideal for those who want to try the new version. Insiders and IT professionals in the Beta channel will be able to check the upcoming features of Windows 10, while receiving relatively reliable updates that will be validated by Microsoft. These releases will be linked to a specific upcoming release.
Insiders and IT professionals on the Release Preview channel will have access on the upcoming version of Windows 10 before it is released to the world, with all the advanced quality updates and some basic features. These versions are supported by Microsoft.
Microsoft also said it may use new channels for more Insiders experiences.
Microsoft will use the same names for Office Insiders. For Office versions, there will be Beta and Release Preview channels, but without the Dev channel.
If you are currently using an Insider preview ring, Microsoft will automatically change your package based on your current ring to the new channel that corresponds best. You will not need to change anything.
- Fast ring goes to Dev Channel
- the Slow ring goes to Beta Channel and
- the Release Preview ring goes to the Release Preview Channel
Insiders can always change these settings from the path Settings – Update and security – Windows Insider Program.
