Unless something has drastically been changed since last Saturday, it is impossible to see the entire layout of the ride as a good portion of the ending is hidden in a long tunnel, which 'may' contain a surprise or two.
I agree that you can't see in the tunnel part so there may be some cool effects in there but when you watch it dive into the tunnel from the helicopter scene it is out of the bilboard and splashing down in about 6-7 secs. I'd also like to know though if the tunnel is going to be in complete darkness or like FOF, with spotlights everywhere. I think complete darkness would definately add something, especially if they do add some sort of "surprise" element.
Think of it as Paramounts version of a heavily themed special effects coaster like those found at the Disney and Universal Studios parks. Not big on thrills, it's all about the experience, but definitely big on theming and the fun factor.