Regarding a white version I think Sideshow has some options to play with here.
Offer it with the EX head. They can sell a boat load of these to people who bought the regular dark phoenix and the green version. Higher ES would sell partly for this head. I like head...I mean this head.
Offer it with the regular head. This will sell mainly to the core collectors and I believe more limited interest meaning a lower ES would be the way to go. Immediate sell out with low risk to Sideshow.
Now let's see what they do.....