Different skins would be nice as long as it isn't over the top. I think they should add more effects on your normal character rather than just disease immunity. Maybe increased speed and strength, and a type of hunter vision that lets you see more clearly in the dark and it detects life.
There is a Night Eye ability for Werewolves in the game's code (works the same as the Khajiit's racial power and the vampire variant) but it was cut for unknown reasons. That's on my wishlist for the lycanthropes, along with enhanced unarmed combat and some other abilities added to human form.
Perks from the WW tree can do that detect life already. The night vision thing would be useful if it actually got dark in Skyrim, I have no use for my Khajiits Night Eye since my game is bright enough to see no matter if its dark or not.
He's talking about in your untransformed state.