Tire Pressure
Tire & Wheel Balance
Steering Head Bearing Adjustment (fall away) and bearing lubrication
If this only happened the one time so far, it could have been just a reaction from the batwing to a particular wind direction or turbulence. The unfortunate truth is that a fork mounted windshield or fairing is not the most stable design in the world. That's probably why racing bikes have frame mounted fairings.
I wouldn't recommend assuming this is just how it is, however. Most people with the new frame design bikes ('09-'10) aren't reporting the same sort of high speed wobbles that were so common on the earlier bikes. Have your dealer check it out, especially the steering head adjustment and lubrication and the wheel balance.
Jerry