I hope at least some of that 'April Fools' joke is true, using weapons, spells and shouts whilst on mounts would be a good addition, likewise a first person camera. I'm not that fussed about Dragon riding, whilst it would be cool at first it would probably get old eventually, but not having to dismount while a wolf is eating your ankles is a bit of a necessity if you're going to have ridable horses in the game.