The ride will be a rollercoaster. I can assure you that. I've had the opportunity to see the plans.
Checkout the site (screamscape) below for a good idea of what the ride will be. I can say that they describe the rumored "mega coaster" pretty dang accurate.
http://www.screamscape.com/html/lagoon.htm
current construction site photos:
http://www.lagoonisfun.com/showthrea...d=4053&page=36