I've seen images of only two types of the beardless Rebel, one was a test shot. The other is hand-painted prototypes used for Hasbro's photography or at SDCC. I've not seen anything to imply any other samples exist other than Hasbro saying they have some... Like Adam said though, I don't count that, really.
The positive for the beardless trooper is he's tooled, and so Hasbro may want to use that tooling. The bearded trooper hasn't sat here, and I'd say the ESB wave has shipped somewhat heavily here. Not as much as the previous ANH wave, but it shipped pretty steadily and I saw fresh replenishment of it tonight on a toy run, actually. So I have hope of getting beardless troopers and I think Hasbro may pull a "LEgends" type deal with this figure too at some point (hey, it's a good figure).
What I don't have hope for is seeing it in either current packaging on the shelves.