It's been discussed in a couple of other threads. You can probably find them with the search tool. I know the Hobie reps on the forums have taken a lot of input for it. Nothing yet has been officially released regarding a larger rudder as an option. Some of the folks on the forum have made some larger ones themselves out of aluminum.
SeaDek Fishing Team
2012 Pro Angler 14 (owned now by a good friend)
2013 Pro Angler 14 - Dune
2015 Pro Angler 14 - Papaya