Jerry,
My recollection is that PM uses Quick Time in some capacity and if it is true that Apple is dropping support for the Windows version of Quick Time how is that going to effect PM?
Unless QuickTime just completely fails to operate and makes it so that PM itself cannot launch, then you'd lose support for BMP, TGA, and Movie formats for providing thumbnails and previews. PM on Windows currently does not play back movies even with QuickTime installed.
PM 6 likely won't be using QuickTime at all.
-Kirk