The prettiest and fluffiest army around. I'd love see some throwbacks like wedge formations, a total lack of warmachines, peasant rabble and so forth. Less interested in implausibly large chariot or monster kits or weird characters with special rules.
I liked the impetuous charge rule in the last book. I think it would be neat if each class of knight had a characteristic liability as well as a special advantage. Nothing game breaking. Just something to distinguish their uniqueness and maybe knock them down a few points. More troops = More fun.