The question is, is IMDB accurate with that info? I hadn't read anything about Lucas "producing" it. Funding it... for sure. But it's not a secret that his involvement in the project has been a bit "loose" to say the least... He approves pretty much everything for the two trilogies, but someone else did for the Clone Wars IIRC from the videos and so forth.
I'm curious his level of involvement... That, to me, determines what makes it EU or not, and so far what I've seen implies he's not involved much at all. Hell, he saw it put together and said, "Wow this is actually great, and should be a full length movie, not just a TV show"... Paraphrasing that of course, but that's the idea of why/how it went from all TV to suddenly a summer movie release.
That at least implies he's pretty hands-off with this... Or he was until then anyway. Lucas probably could earn a writing credit on every aspect of Star Wars too, as they're his creations generally, in which the story revolves around them. And he's able to nix anything he wants, when he wants, and steer the people who are truly helming any of these EU projects in a direction he wants them to go.
What then though, is a "fair gauge" on EU? If it's not the creator's involvement level, what is it?
What makes a comic book more EU than a novel? What makes a cartoon less EU than a video game? Lucasfilm's own stance on EU/Canon/Continuity is that if it's from Lucas himself (IE: the 2 trilogies, and essentially their novelizations/adaptaions), it's gospel... Everything else is part of the story as a whole, but (as the saying goes) "the rest is gossip", and that's pretty cut and dry.
Call it the official continuity or whatever... To me it's looking great and I'm pretty sure already I'll gladly embrace it as the way the Clone Wars play out that we don't see on-screen, same as the 2D toon is to me. I'm all geared up for it right now really. But at the end of the day it'll never be as rock solid to me as the films are. It'll be its own thing, separate... Like adding a book to Middle-Earth that Tolkien didn't write but had a rough outline of and someone put it together for him posthumously... Lucas lays the groundwork and now other people take the helm to fill it in... It's the same as just about any novel, comic, or plotline from a video game in EU to me.
There was a great quote I read once about Lucas addressing all the expanding stuff, but this was a whole long time ago before all this EU was out.
Basically though it was Lucas saying something along the lines of, "I created Star Wars for people to enjoy, and I allow other people to dabble in the universe I created to have fun and expand on it because there's a lot more to it than the movies, but I also know there are certain things that can't be covered by anyone but me, and certain directions I don't want characters to take..." blah blah blah... I think it was more a quote referring to the expanding stuff at the time he was makign the prequals too, but I think it's still a (very) rough quote that applies to this conversation too. Lucas basically has only 100% been involved with the 6 films, and that's it. Beyond that, he reserves his right as the guy that made it to change whatever he wants, whenever he wants, and that's the "final", or "canon" version of that item. Case-in-point, the SE's totally changed the OT, for better or worse.
Those are the types of things that make his level of involvement a very key element to me. If he's really the guy helming it, making all the approvals or denials, etc., then I see it the same way as the two trilogies. Otherwise I just clump it into the lump EU category.
That said though, to me EU is just as LFL describes it all being part of the "official continuity" as they say, and unless it contradicts the films it's just to be accepted for what it is then. It's nto really a major issue/debate then, so much as it's a matter of semantics. I don't think Lucas looks at the CW3D cartoon as anything but another addition to the universe he created. What then is the difference between EU and Canon, other than a level of involvement of the guy that created it all? Not much really.