[Tarquinius]

I just realized. The three stock photos may give a hint. Moonstone's and Osborn's pictures are done by Mike Deodato while Archangel is just a shot from a comic.

What could this mean?

We saw Moonstone at Toyfair and she has art by Deodato, so that might mean they will release her but they are giving us the option whether we want it sooner or later

Osborn technically would already have one because he is on the back of every MU packaging anyway

Archangel, they may have not considered for a single card release as of yet considering he does not have art work, afterall Hasbro does know the MU lineup for the next year and a half. But I'm sure they recognize the value he has to completing XForce and as such they may be using this venue to fullfill that need.

I may be reading into this a bit much but with Hasbro sometimes you have to :-P