RealClimate: Atlantic Tropical Cyclone Records Trends and Ephemerality
In summary, the new analyses reveal that most of the long-term trend in TCs over the hurricane record is due to an increase in short-lived TCs and that there seems to be no significant trend of medium to long-lived TCs. However, it seems unlikely that this trend can be explained solely by an observational bias. Establishing the underlying physical reasons for these trends is a challenge for future research.
Interesting summary of new studies regarding TC (Tropical Cyclone) trends, or lack thereof. The post at the link is much longer, but I inserted the most interesting paragraph, IMHO, above.