It's all in the elite release threads.

It's 3 new full body shaped based off real model scans, and textures derived from ungodly high res digital model images done with a 36 megapixel camera for ultra fine detailing.

They also included new special dshaders for Poser and DS.

It's targetted really at professional users, and the developement costs were extremely high, hence the product cost is also high.

Way too many people take way too many things way too seriously.