I feel sure the models will be seen to be accurate. If you look at the latest flash animationsfor the Eastern U.S. at the NHC satellite link ( I think "water vapor" is the best representation, ) you will see the cause of this predicted turn as it's about to happen. There's a North Atlantic low with it's own cyclonic rotation that has been stationed there the whole time, and "Sandy" is just now coming up against it. By appearances, it will be squished back to the west, if that's not too technical :-)
There's the turn! At OCT 29 12 03:45 UTC