Scoblete's Strategy for Double Deck face up?

Scoblete in an interview with Robert Lux on Advantage Player mentioned that he had discovered a situation that develops in double deck, hand-held games where the dealer deals the players' cards face up. Does anyone know what this is? If you can't tell, does anyone know if it works or not? For the life of me I can't figure out what could develop in a face up double deck game that can be exploited. Scoblete said that no one had yet written about it and he wasn't going to write about it. But I'm thinking that someone else might know or at least know if he really is on to something.