new design for the prowler 13?

How ya'll are!?
 Got up early and went for a walk to my local kayak dealer (2 blocks). I was looking in the window at the new P13, the rudder area is different from my P13. Did they discover a better way to rig the rudder? Is this the only change they made?
 I'm helping a friend shop for his first yak. He is going back and forth over the wilderness system tarpon 14 or the OK P13. Does anyone have any particular likes or dislikes about either one? This is for fishing only.
 Thanks for any input here as he is itching to buy this next week.

I believe the rudder designs changed for the prowlers (13 and 15), but am not aware of any other mods.

-Allen