IF THE "I KID YOU NOT" GUY IS NOT IN SPIDER-MAN 3, IT WILL TRULY SUCK...
AND THE SPIDER-MOBILE, YOU GOTTA HAVE THE SPIDER-MOBILE!!!
Seriously though,
(Most of these are givens)
1. A more confident PP/SM and MJ (I'm pretty sure they will be. Thus, maybe they can finally silence the few doubters of Tobey and Kirsten)
2. Aerial dogfights and chases, or at least better action between GG and SM.
3. Give MJ her hair from the first movie.
4. I don't expect this one, but I'd like to see Liz Allen. Harry's been alone the last two movies; it would be good, from a dramatic standpoint, to introduce her. This also depends on Harry's eventual fate.
5. More Ross Art! (How much you wanna bet the color scheme for the opening credits next time around is black?)
6. I don't expect this, but I'd like to see the movie open with SM fighting a minor villain.
7. Sick Aunt May (It would be nice to see this, considering how many times it happened in the comics. However, I don't know if I would seriously want it worked into the plot.)
I'm sure there are more things I'd want to see, but I can't think of any at the moment.