You need to look at the price for a single day MK ticket. If that goes up then you know there was a price increase built in to the new pricing scheme. To minimize any price increase you are going to want to minimize the number of Peak days in the usage period for your tickets.
For example: a 5 day ticket has an 8 day usage period (I think). If you have a start date on a Friday, Saturday, or Sunday you will have 3 weekend days in the period which for much of the year are Peak days. Monday - Thursday (which are mostly regular with a some value mixed in) would only have 2 weekend days.