As it gets closer and closer to release date, this camera seems to just get better and better. I wouldn't be at all surprised to see this picked as the "Camera of the Year."
Total exposure = (Ambient Component) + (Flash component).
Faster sync speed allows you to pull down your ambient exposure component down. If your goal is to shoot at wider apertures and to drag down the ambient component then you'll want as fast sync speed as possible. If you are shooting at narrower apertures (e.g. macro with plenty of depth of field) then ambient contribution is most likely low in any case so I don't see a practical benefit.
