I'm finalizing my bookings on Icon and drooling over the rest of the ship I've noticed something of concern on the Icon of the Seas Flowrider... Beyond the fact that there is only one, like the Wonder of the Seas..
Specifically, the wash out area on the flowrider seems to be extra small in the renders shown. The back wall being too close, the washout area at the top being too small has been a noted problem, discussed by frequent riders, on the Quantum class ships. As a result, when bailing on those ships, you hit the back wall much harder and risk more frequent and greater injury.
Hope this flowrider (on ICON) addresses this issue, and certainly doesn't make it worse!