Congratulations to the kiters at Luderitz - those are some pretty awesome performances. Given how quickly they were able to push their speeds up to those levels from where they were just a few years ago, there's been a lot of very rapid development in that sport. Good on them!
I wonder if this will spell the end of the speed rush windsurfing has gone through in the last few years, with several well-organized record attempts and a bunch of grass roots GPS-based informal competition. I also wonder what it will take for windsurfing to reclaim the outright record - it took Maynard and Albeau a lot of time, money, and R&D to get to 49.09; kiters just blew right by them, and physics seem to be on their side at this point. Seems like the current gear and technique combo needs to be tweaked a bit to get back in the game. The sailors have been trying to do the same thing vis-a-vis windsurfing (check http://www.sailrocket.com/ or http://www.hydroptere.com/ to see some of those attempts - none of them successful so far) Perhaps we'll end up seeing some crazy foiling windsurfers with funky outriggers to get on top of the physics here - but given the state of the industry, I'm not sure where the funding for such extensive R&D would come from. Incremental improvements to the current design paradigm seem to have run into the law of diminishing returns.