I saw this funny line from the
GW legal page;
http://www.games-workshop.com/gws/content/article.jsp?categoryId=&pIndex=3&aId=3900002&start=4
"you cannot place our Space Marines in a Disney total conversion using the Unreal engine, but you could make a TC solely using Space Marines with the Unreal engine. This is, of course, assuming that you have permission to use the Unreal engine"
Thats too bad, I've always wanted to see Mickey Mouse, Donald and Goofy fight the forces of Chaos and the daemon prince Chernabog; maybe an Orky Kaptain Hook and perhaps Disney Princess Sisters of Battle! or perhaps 101 Fenrisian Wolves!