After looking at the GFS (and related GFDL), it appears that they are starting to respond to the non-merging of the lows that were over CA and AK. (The ones that Colleen and Genesis were talking about last night). It was assumed that if they did not merge that the 1st low would turn more polewise and pull Wilma on a more northward track. It appears that the GFS has instead decided that without them merging, and with Wilma getting stronger and not moving north fast enough, that the trough won't get deep enough into the gulf to influence Wilma. This causes her to drift over the Yucatan until the trough pushes further south (across Florida), catching her on the tail-end and pulling her east across Cuba. I don't know that I buy it, but as the models show, anything is still possible at this point.