The NHS just announced sustained winds of Irma are now over 185 mph and that it's present track suggests it is going to skirt the windwards and Puerto Rico. If that happens, they expect it to continue strengthening. They also said that they don't anticipate knowing until Thursday whether the storm is showing any signs of changing it's current northwest track.
Interestingly, the prime speculative models are now showing two different scenarios: Euro shows it sliding further westward once it reaches the Bahamas and possibly entering the gulf. NHS shows it stalling at the southern tip of Florida before possibly moving north.
Again, these are speculative projections, not definitive tracks.