Microsoft hasn't yet officially launched Windows 10, codenamed Threshold, but already rumors are flying about the next version of Windows after that. Unnamed sources tell Neowin and ZDNet that the next update to Windows is codenamed "Redstone" (after an element in Minecraft) and that it will arrive sometime in 2016.
They say that this next version of Windows will be part of the regular update cycle and will not be labeled Windows 11 or Windows 12. It is likely to include additional features that weren't ready in time for the Windows 10 release.
Microsoft has not commented on the rumors.