We have introduced PREMIUM systems. Those are new SAP releases NOT AVAILABLE anywhere else. There are special prices as support for those new systems is way more expensive. With PREMIUM systems you can not purchase long term subscription, you can not be moved from Regular to Premium system. If you would beed to have backend system for Premium System if it is not already in the price, then you would have to purchase Regular SINGLE account for non-premium backend system.
Right now CRM 7.0 is available as Premium system.