Speculating ahead of the next major iteration of the Retina Macbook Pro and what changes there might be. I see it as likely that Apple will bring the new butterfly keyboard as standard across its Macbook range when a model is redesigned. If Apple is going to push USB-type C as the future then it will need to include it on the Retina Macbook Pro. Apple doesn't need to make the rMBP any thinner but could it replace any of its current USB ports with a USB-C port? Do you think it is likely Apple keeps two Thunderbolt ports on rMBP? Not many other companies are adopting Thunderbolt and with USB-C able to largely do the job of Thunderbolt (not fully) so will Apple decide to give up on Thunderbolt outside of its Mac Pro machines?