@Swagner the best that you can get as far as Japan's copyright laws, is when a show references another work that the writer did: such as lucky star having manga tanks of haruhi. Well, and just generally stories made in the same studio referencing each other.
This may be a little selfish but i sorta want to see the conclusion of the trouble between Yukino and the impersonator more than i want to see all this other story...