My Ford salesman buddy just took a guess at mid 50's price. Says that production numbers will be similar to recent GT500 numbers. Says the car is faster on the track than the Boss or GT500 by an order of magnitude. I think that means a LOT faster.
I would agree with your buddy, personally. Though that it's faster than a Boss isn't impressive--it's been said that the GT+PP is faster than a Boss. That it's faster than a GT500 isn't all that impressive either since it's more of a straight line bruiser than a road course junkie.
And with a price in the low to mid 50's (IMO), it gives room for a GT500 that expands past the current car without being outrageously expensive.