I saw on MyNintendoNews a couple of patents that came out that have interesting NintendoLand possibilities. For Both a Mario Kart and a Donkey Kong ride.
Per MyNintendoNews:
“A two-rider, car-based amusement racing attraction with the ability to simulate drifting sensations. Two passengers, who could be in time/points competition with another car, will have control over some aspect of their ride vehicle: The driver would have a steering wheel and an acceleration and brake pedal to control the turning/drifting of the vehicle and speed; the rear passenger would have a control interface with buttons that could control the vehicle or bounce the ride vehicle, provide a boost to the vehicle during the race or affect the performance of another ride vehicle on the track, said the patent."
The boom coaster is “This is a unique arm that would attach to a ride vehicle to help enhance rides that appear to be on a track system, but are actually controlled by a separate arm. For example, the arm could be C-shaped connected to a secondary hidden track underneath the track guests see. As a result, rides that have story element breaks in the track — say like an upcoming jump from one track to another — could cause suspense. “Because the passenger may believe that the simulated ride surface controls a path of the passenger vehicle, the passenger may fear or anticipate that the passenger vehicle may crash or otherwise incur damage as a result of the elevated gap,” said the patent. This has many fans thinking it could also be related to Nintendo via the Donkey Kong Country video game series, which features areas with cars traveling through dangerous mines filled with jumps, dips and turns”
Naturally Patents are not anything close to confirmation of what rides there will be but its interesting speculation.