See the edit. I know he has worked with Lucasarts. But that does not mean the art was necessarily done for Lucasarts. Even artists with fulltime employment make art outside their employ. Though he could have made it for a scrapped KOTOR 3.
Your second statement is blatant assumption. Whether or not it's scrapped. Whether or not it was made for an actual project. If it had been scrapped, it's up to whoever the art belongs to for whether or not they'll be linked or even uploaded to his website at all.
I don't oppose the idea of KOTOR 3. I oppose blatant rumormongering and the constant neverending flood of reading way too much into every magazine article, press release, company dealing, merger, or piece of concept art that leads a drove of idiots to come out and start proclaiming that THIS! THIS! Finally THIS IS THE TRUE AND REAL CONFIRMATION OF KOTOR 3 BEING IN DEVELOPMENT! Unlike the last 50 billion things that caused them all to jump on board and make wild assumptions based on little evidence.
This is confirmation of nothing. If you want confirmation of KOTOR 3, wait for the press release. Stop jumping or creating rumors and trying to pass them off as fact. Pass them off as "it'd be cool" or "what do you think," anything but "CONFIRMED OMG KOTOR 3 IN PROGRESS FOR 2009-2010 RELEASE!"
If these were even 2007, you might have something to get excited about. 2004 is just reaching. Concept art that old would be scrapped anyway, even if it were in production.