Kerry (Emanuel's) take on his own new study was that it didn't prove his previous study wrong. Somehow I tend to believe his interpretation of his study.
I don't know about you but if I'll ever wake up on the operating table with the wrong body part lopped off, I will not "tend to believe [the doc's] interpretation" of the events. At the least I will seek other people's opinion!
Here is another article interpreting the new study.
"Noted Hurricane Expert Kerry Emanuel has publicly reversed his stance on the impact of Global Warming on Hurricanes."
Also, please see the original article by NYT's Revkin who actually communicated with Kerry on this.
"A fresh study by a leading hurricane researcher has raised new questions about how hurricane strength and frequency might, or might not, be influenced by global warming.
...
[the new study] definitely rolls back Dr. Emanuel’s sense of confidence about a recent role for global warming."
Also please note Kerry's own words in the same article.
"The models are telling us something quite different from what nature seems to be telling us. There are various interpretations possible, e.g. a) The big increase in hurricane power over the past 30 years or so may not have much to do with global warming, or b) The models are simply not faithfully reproducing what nature is doing. Hard to know which to believe yet."