Chris Landsea has shared his just-out paper from EOS (PDF) and send the following capsule summary:

The link between the frequency of tropical cyclones [hurricanes and tropical storms] and anthropogenic global warming has become an emerging focus. However, an analysis of the data shows that improved monitoring in recent years is responsible for most, if not all, of the observed trend in increasing frequency of tropical cyclones.

Comments, criticisms, alternative perspectives welcomed!