Port Carveton sucks sooo much. It's a shame, because they brought in so many improvements this time around, but it's really all for nothing because the main level is so bad. And with the exception of the new dlc, all the other ones were terrible as well. Remember the skate2 classic pack? Had 3 huge levels with lots to explore by jumping over the fence. Plus the fantasy factory which wasn't the greatest, but still better then the maloof, after dark, and hawaii levels combined.
I haven't ever heard anything definite, but word on the street is that there isn't gonna be a skate 4.