The central pressure forecast by the GFDL corresponds more with a category 3 storm. I'm not a big fan of the GFDL wind output. The model does suggest that Wilma will grow quite a bit in size.

As others have alluded to, there is a chance that there could be significant interaction with a mid-latitude system to its west in the longer range, which could result in a very strong low pressure system which may or may not still have tropical characteristics affecting New England. Such things are very difficult to forecast, though, and Florida will have to deal with this first.