Brian Flynn who owns Super 7 has been answering questions over at Rebelscum and has basically explained that the more tan base in the blue box is the comic con exclusive, the one that is up for preorder until tomorrow will be charcoal in color, in the black box.
They are doing hand cast resin unless they hit some magic number of pre-orders at which point it becomes more cost effective to go with injection molding. Here's his exact post:
Injection molding is what you typically see with most plastic. You create a two/three part metal mold, shoot the plastic in at a high pressure (forcing all air bubbles, etc. out). The plastic is melted heading into the mold, and then cures and dries inside the mold so that it pops out in its final form. The metal molds to make the plastic are very expensive. A mold big enough to make this playset in one piece is somewhere between the size of your microwave and the inside of your oven. It is incredibly expensive to make because of the size of the material needed to withstand the pressure of injection molding. The plastic itself become relatively cheap, so, if you make tens of thpusands of units, you can amortize your mold costs into a small fee per piece of plastic injected. If you make a very low amount of pieces, the mold cost becomes a huge part of each per piece cost.
With resin, you can use a variety of temporary molds (most often silicone), which is much cheaper, but they break down very quickly, and are only good for a limited number of pulls. Additionally, resin takes quite a while to cure and dry (not all resins, but many.) There are a ton of different kinds of resin, and the one we are using feels the most like injection plastic that we could find. In the case of resin, the material cost is much higher, and the labor of making them is higher, as in this case, they can literally only make 8 playsets per day with cure time on the resin.
Resin typically is a bit more fragile, but the resin we are using has a bit of flex to it, so we should only have issues with dropping onto hard surfaces. Does this help?
So, we'll see.
I bit the bullet and ordered one - I don't like the price tag, but I want it.
Also this image of some mock-ups for future Alien figures was posted (it shows the lighter color base for the 250 first-run in the blue box) :
These are apparently the figures that are in the blind-buy eggs: