Well DX as far as I understand it, and please those more knowledgeable chime in, DX compliance only applies to PCs as its a property of Microsoft. From everything I've read regarding the WiiU and its rumors, it can be argued either way. Some people have said it has DX 11 equivalent features whereas others claim it to only be 10.1. Others have said it supports some of the equivalent features but not all. I don't think we'll know until someone opens up an actual WiiU and sees whats inside.
I think all this is being made to be more than it should. I don't really think it'll matter much if its 10.1 or 11, games will look good on it as long as developers put in the effort. If games like Uncharted and Assassin's Creed 3 can be done on such old hardware such as whats used in the PS360 (which are equivalent to DX9 I believe, don't quote me though) then how much better can games actually look. They look amazing now and if that's what the WiiU can do AT A MINIMUM then I'm fine with that and I'm sure everyone else will be.
If a new Zelda gets released and looks amazing, who in their right minds will care if its running on DX 10 or 11 equivalent hardware? Only fanboys who want to compare spec sheets will care. The majority of gamers won't be able to tell the difference IMO.