Windows 8 has been pegged with the RTM title for some time but that does not mean it is really done. The code was simply ready to ship to PC makers and for developers to get busy creating apps.
The end user experience in Windows 8 has remained problematic, mainly due to the incomplete nature of the core app experiences when using the tile based WinRT interface. Whilst there have been a few minor updates nothing much has changed from when the OS was in its first public preview. All looks set to change as Microsoft just announced a slew of coming updates to the entire set of Microsoft WinRT apps.