Mod80,
The features that will cause Katia to turn (a break in the subtropical ridge and a large trough over the eastern U.S.) are already in place. At this point the situation is similar to watching a cork floating in a stream, and noticing a change in the current downstream. Of course the currents can change, but it is highly unlikely.
Don’t forget that there is a vigorous tropical disturbance to Katia’s southeast, about midway between the western coast of Africa and the lesser Antilles. There’s a good chance that it will become TS Maria soon.
Another interesting tidbit: the name Katia is the replacement for the now retired Katrina.