In fairness, I don't think he's asking for what we'd see in terms of re-doing photos and images to create the poster with new photos. I think he's just asking what figures to put on the poster itself. I could definitely be wrong but that's how it read to me.
I'd like to see all the releases up through Castle Grayskull (and any others that may be coming post-Grayskull if they have the photos to include). Basically, a collection of the photos/images of everything possible in one master "check list".... variants, etc.. you name it. Put it all on there!