For *still photography*, with the new fast AF features and many frames/s captures, the new A55 offers some advantage (already offered by the likes of Canon 1D MIII, etc).
Apart from the size advantage, bird photographers could use it for birds in flight shots (are there any fast/medium-fast telephoto lenses for the alpha mount?).
I am already planning a purchase of a suitable lens for my use (it will be for experimenting with the camera for non conventional use). Most likely, I will go with the Zeiss 16-80 zoom.
I am curious about what others intend to use it for (again other than for videos).