whoever's on the WL before the order goes into production will likely get one. All SS has to do is up the order -- that is, if there's enough WL orders to fill each additional batch. They factory 'bump' orders probably have to be a fixed number, like say at least 150 or something like that, so if the WL orders are 350, then they could order another two "batches" and only 50 WL orders will not be fulfilled.
I don't know any of this, just guessing based on years of reading stuff on this around here.