I doubt it will happen. They've been rolling with 2 USB ports on their laptops for quite a while now.
On another note, what are the chances that the new OS will be free to download just like Mavericks was last year?
I think they will continue you make them free because of the Mac App Store. They probably want all Mac users to have access to as many apps as possible on the Mac App Store. It's likely that making divisions by OS X versions could limit app availability.