AH, so using that logic, you would say Episodes I through IV are canon, but Empire and Jedi are EU. After all, they weren't directed by Lucas, so he wasn't 100% at the helm.
I think you're on the trend, but I like to think that EU stuff is very low Lucas involvement and limited exposure. The novels, comics, etc. are all things Lucas approves, but isn't really driving and it has the potential not to be acepted by the majority of SW fans.
The Clone Wars are very different from this. They're mentioned in Episode IV and we see elements of the war in Episodes II & III, so you have reference to the war in half the movies. We have comics, novels, and a cartoon all based on the Clone Wars and now we'll have a movie/new cartoons as well. For that reason, I'm classifying the CW as something more than EU.