As it is shown by Hawking the area of the events horizon never decreases, but it depends only on the mass of the black hole and it's rotation speed. But when the hole evaporates it's mass decreases until in won't become a Plank's black hole. What happens to it's events horizon while such evaporation? Does it's rotation speed increase so it becomes more and more flat ellipsoid looking like a pancake with same area? The evaporation is a quantum process, but the Hawking's explanation with two light rays going on the events horizon is unlikely to be violated even in quantum mechanics.
