Schiller walks on stage: “Hello, today we are announcing updates to all current Macs. We are starting by making SSDs standard on all new Macs.”
Then the only other Macs that Apple would have to talk about are MacBook Airs. Boom, every Mac updated.
This, I think, is far more likely than any other mass update and this is an update that I would expect would come before any retina display Macs.
This type of an update does two things for Apple: it makes it harder to comp Macs against other computers, and it makes Macs blazingly fast for all users.
This would be a great move by Apple.