Not a hope. Aster, as we knew it, are gone, Jim. If you didn't gots one already, you sure are not going to get one unless you buy a used model.
Do you have any idea how much Hans Huyler had to put up front to get that model produced? Think of a number, and then double it. I doubt that $3/4 million would be anywhere near enough to even restart the project for such a complex model, assuming that Aster/Accucraft would take it on. You DO know that the sponsor of any Aster model had to pay for the whole run in advance, right? Then sell them.
As Ryan Bednarik of Triple R Services notes -
Given that Aster made some 258 units of the S2 for production, I highly doubt we will see that re-run anytime soon (they did take their fair time selling out, so that makes it even less appealing) as that is not a common style for Aster to just re-run.
Your best bet is to watch the used market for when one comes up for sale. It would take an overwhelming market majority to want this production again for it to even be considered, in my skeptical opinion.
With that number made, I'm positing that everybody who wanted one, got it. And that's it. Don't overlook the need for something for it to haul, either. Mike Smith of the G1MRA scratch-built a set of 'Empire Builder' passenger cars because nobody actually made such a model. Here you can see them being hauled ahint my Royal Hudson, over the track of the much-missed John Squire a few years back...
And here's Mike's S2 doing its thing....