Given that Jason III is arguably the most popular version of Jason and was begged for for years around here and the lower, by today's standards, price of 279 and a very low edition size of 750 and the HUGE discounts during spook and free give aways, he is still not sold out after months in stock, not even low quantity status, I think he isn't the smashing success Sideshow probably thought he would be. I'm honestly shocked he is still in stock. Its baffling, really.
With all that I don't see Sideshow rushing back to do another Jason, or any classic slashers, save for Myers, as Sideshow has said for years they would love to do one, but license issues still hover around that.
So we already know Pinhead is coming, maybe a Myers some day, but another Jason? Doubt it.