IDX11 isn't an announced feature of Cataclysm yet, and the screenshots are from a beta product. Why is everyone acting like it's shipping like this tomorrow?
Because a beta is supposed to reflect the final product and should only differ in the number of bugs.
These screenshots suggest a lack of about 1-2 years of designers work and mind you: As DX11 allows exactly 0 things, that cannot be rendered on DX9 or 10 hardware (though at less performance) or in worst case by a software rednerer, the designers could and should start working on detailed models a long time before the final engine is avaluable. That they haven't done this yet is a very strong hint, that they will never.
On the other hand, I agree:
Why is everyone making a fuzz about it? WoW has been locking old since the day it started and anyone, who is still interested in WoW today should have found a lot better reasons to play, then graphics.