Here's the story as I know it, folks.
Bill Kalush is the Director of the Conjuring Arts Research Center (CARC). He produced several decks of cards with USPC, but wanted to take a different course, scouted out many printers from around the world, and settled on one located in Taiwan, the name of which is an industry secret. He used another location from Shanghai, but the cards from that plant weren't as well received. There are some old-school card men who swear by them, but they do take considerably more breaking in.
Bill worked with Lawrence Sullivan in the production of his Legends deck, version 1, from which the Legends Playing Card Company grew. They both are exclusive agents of the same printer in Taiwan. Legends PCC appear to be taking orders from designers in the Far East, while Expert PCC is taking orders from designers in North America and Europe.
Anything more than that, I'd actually have to ask Bill.
BTW: you guys do realize that not only is Bill a member here, but that the Expert Playing Card Company has an official sticky topic in the Plethora? Right? And that there's an official "company rep" rank, with a company identity for EPCC, specifically created for answering questions and disseminating information about upcoming releases?
Sometimes I feel like I'm talking to myself around here...