I saw that hint also and have no idea who else they could be referring to. Lighthope makes sense, but I would be surprised to see that and a Rock Warriors 2-pack at SDCC. I wouldn't complain though. An exclusive is a much better spot for a character like Lighthope than being in the subscription.
We shall see....the rumor has always been two exclusives
I really want Rokkon and Stonedar now