It's stronger (by 1%, a grand total of 7%, which beats out most beer anyway) and has a black cherry kinda taste,supposedly, which is less intense than the original. (Which can be a bit much when consummed in mass quanities)
It's called Sparks Plus, and has a black top instead of the normal orange.
As far as I know, it still has all the usual caffeine and such as the normal sparks... It is hard to read what the can says in a dark club.
Overall think it's pretty good if it is your thing.
I only had one, since I wanted to sleep last night. So I have no idea how well they pile up.