The game that was released after king Arthur was ""The kings crusade". A similar game with the Crusade of King Richard vs. Saladin being the setting. I haven't played it simply because it dind't sound as fun as King Arthur, but it got pretty decent reviews.

Just read about Fallen champions, which seems to be a stand-alone expansion to King Arthur. Think I'll just go ahead and buy that when it comes, to kill some time waiting for King Arthur II.