My sales rep at Martin is saying it will be just a sac option. He may not have been told the truth or cannot say. For what it is worth, my 13 x30 can switch sides as fast as a surf gate boat. I fill all ballast including my plumbed in 750's in the back lockers and the small sacs (250's I think) under bow seats and use my surf tabs to change sides. Works good and makes it fun to fool around with going from one side to another. Still trying to learn to do it with no rope. Here is a shot of the port wake. Just me and my wife and 2 kids in boat. I will try to shoot a video later today or tommorow. Just not sure how to upload it.