Don't forget the cost of the DLC you'll have to buy if you didn't preorder...
I can understand releasing more maps later on and charging players for it, but only one map to start with on the challenge mode? Come on. That just feels like pulling the rug from underneath people after you've been demoing the mode for the past 6 months. Will probably wait until that season pass is part of a steam sale.
Sega seems great at getting people back into their good graces only to do something kind of annoying.