Thanks to TV Guide’s Natalie Abrams for the following tidbit:
Will we find out whether Desmond was really on the plane on the season premiere of Lost? — Carrie
MICKEY: “We will answer that question very shortly in the show,” executive producer Carlton Cuse tells us. “It will absolutely be clear whether he was on the plane or not.” Does this help? We’re also hearing that the next time Desmond appears, which might not be for a while, it’ll be with Penny at his side.