I'd agree that Enhance needs less "new stuff" than Ret, and in any case we're talking more about a new talent or two and less that you now have combo points to manage.
The way i interpret this is that blizzard is adding new talents to add more variety and options to a ret/enhance shaman's rotation and allow for choices, for example more things like exorcism. the whole "less that you now have combo points to manage" means that they don't want to make them into rogues/druids and rather have them continue their priority rotation but add some flavor to those choices in the priority.