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This article would suggest that climate change is not responsible for the frequency but it could be associated to the increased intensity. There are obviously no solid conclusions.
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Its cyclical...always has been and always will be.
The whole El Nino effect if you will.
Every decade and a half or so, the Gulf warms up 2 or 3 degrees above normal levels.
This year happens to be a collaboration of a few things coming together. Warmer water is also in place off the Canary islands which is what spawns the tropical depressions that move westward. If they stay somewhat organized, when they reach the south Atlantic islands/waters, they have a better chance of becoming storms. Then if they last that long, a natural tendency is for them to move N/NW into the gulf (depending on the jet stream) where they really pick up energy, or N/NE where they eventually just go and fizzle out over the cooler waters of the N Atlantic.
Its just a recipe for major 'canes this year with many elements all falling into place at once.
The whole "global-warming" thing really has no part in what we are seeing this year.