Well, clearly he's perfected the tail to the point that Toothless flying by himself is POSSIBLE (though it may still be that he can fly better with Hiccup on him). And that armor was interesting... very interesting.
I want to see Astrid, too. She's been very prominent in all of the posters and most of the other promotional artwork (and looks happy with Hiccup in all of them, too) -- I want her to have as big of a role in this movie as that implies. One of the problems I have with "Dragons: Riders of Berk" is that her role doesn't feel as strong as it should. (Astrid and Hiccup's relationship is diminished, I feel, and it's reflected in her being sort of put aside, some episodes, when she shouldn't be)