The "3" parks or whatever they are claiming are all technically on the same line, the upper and lower sections are connected by a short traverse through a small tree patch.
As far as I know they got rid of the jumps, but if they have any they arent going to be very big. Also they have implemented a park pass thing. You need to pass some sort of test to get a card saying you can ride the park.
I stopped going to Brighton 2 years ago so don't quote me on anyting but it should be fairly accurate.