They didn't say perfect bound. I'm assuming prestige format will be the same format as Valiant's prestige format, since that's where most of the people involved came from.
I don't know how many they'll actually get out there, but I fully expect that there will be more than enough interested buyers (considering the quality of the creators involved) unless they purposely overprint, but that seems unlikely, considering they want to limit purchases to one-per-customer, so there shouldn't be any significant volume left to return.
Considering that there are ties to a television/movie production company as well, I imagine that adaptations will be another stream of revenue for the creators involved.