We had this recently with a customer of ours who had a quote from us for 5.7 CCM & MMC but by the time he came to order 5.8 was GA and the new licensing modle was active. This meant that, as MMC is part of the 'premium' feature set , the cost was now more expensive than the previous quote but PF maintain that you get more for your money.
It is all based around your starter pack which limits what features you can use. If you buy the Premium Starter Pack and additional premium agent licenses you can use pretty much every feature on the CCM/MMC including screenpop, phoneset manager and all MMC medium types.