Well, number one-
I do not like how the shoulder buttons no longer spin, they're used for transfers. I only don't like it becuase I keep hitting it accidentally.
However, it's really necessary since the ability to go over the spine is really cool.
Second, as best I can tell, you can't remap your tricks. Now, you can change your specials and the button presses to use them (as well, you do not have have to use the touchscreen for the specials. which is good) but you can't change your normal moves. At least, I think. If you can, I haven't found it.
Which sucks because I have my old way of working, and I really want the christ air to be left-right-grab (but it turns out, it's not even a special anymore. which sucks, since the 900 christ air was my finishing move).
Now, that said, I really dig the rpg-esque stat system. you no longer 'spend' points on skills, you develop skills. If you can hold a grind for longer than 5 seconds, your grind goes up. If you can land a combo with 3 flip tricks your ollie goes up, grab tricks increase your air and so on.
What's really nice is, if you were actually good at something, you can level up in no time. My lip tricks are almost maxed out already, but I've always been good a the gymnast plants. So even if you start a new character, you can start busting out moves and you'll see your stats just +1ing real quick like.
The ability to grab onto cars is cool, wall plants are very cool and it seems like manuals are easier to perform.
All told is a very good game. The online is a good deal of fun, but I'd almost call it a gimmick at best. Since you can't chat at all, and you only compete with one person... I guess it doesn't really feel like you're playing someone else at all.
That said, it's a good game and I'd reccomend.