Please note that we cannot build our Worgen and human forms separately. You choose one option, you're stuck with the corresponding form. However, you can see your human counterpart as you create your Worgen so that you don't get anything too icky. :)
I'm looking into whether or not we'll be able to get Barbershop-only human hairstyles through the Barbershop. Formerly bloodelf-only hairstyles are not available in the creation screen.
I only apologize that I didn't have time to put Model Viewer human forms by the Worgen models to make the comparisons easier. :/ You'll need to click on images to see the human version clearly in the bottom left corner.
Credits go to this video.