I've been watching the storm non-stop since late Monday last week, as I have to for my job. The forecast has changed over and over and over, as is very common with hurricanes. They're highly unpredictable, especially when trying to project more than a half day out. The current trend is very encouraging, the storm is weakening considerably and trending away from having an impact on WDW. However, just stay tuned.
As for what will happen over Halloween, completely impossible to say. That's the end of hurricane season, so odds are lower, but doesn't mean it can't happen.
For me, we'd go to WDW anytime. In fact, summer is our favorite time. WDW is pretty far inland and well isolated from a major hurricane. It's pretty uncommon for them to take a direct hit.