Fascinating! I love good questions like this as they inspire me to do more research.
All right, this is only one site, but it looks very well documented. The summary is that, for a number of reasons, our measurements are inconclusive and can't really show any trends one way or another.
The models (which have a high level of uncertainty) seem to indicate that as the sea level temperature increases, we will actually have slightly FEWER hurricanes, however the ones we get will be slightly stronger.
I'm going to read more in depth, the site I found is
Global Warming and Hurricanes
