I would be reasonably certain we will get her re released - after all we have had Celestia and Luna as FS so they have precedent for alicon/pegacorn/unipeg [I am covering all bases here
]. At the moment the last wave is Pinkie/Luna/Rarity and we haven't had a new wave confirmed or released. So any FS or Celestia or Twilight who are still on shelves are from older stock.
Its a big and expensive mould line for them - it also seems to have been popular. I am sure we will get more waves - we have already had another Pinkie confirmed after all and she will be packed along with someone, I would guess duplicates from the existing releases as if the ponies she was coming with were "new" they would have been included in promotional material.