@Mark - although I agree more examples would be appreciated.
This feature heavenly integrates with your MVC application. Forcing you to use (a very old version of) the CK-editor also has it downsides.
FYI: although I don't think it will contain WYSIWYG-editors in the latest blog post about the K12 Service Pack there is a note about more ready to use inline editors:
Therefore, along with the Kentico 12 Service Pack’s release, we will also provide you with a range of selectors ready for your MVC projects so you can develop faster.
Since this feature is quite new not much examples are available, but give it time and the community will be able to supply more and more examples!