Square Enix is planning to make Aya's costume for Lightning available for download on the 22nd, sort of to get ready for the amount of vouchers they're sending out, this could possibly mean The 3rd Birthday pre-orders and selling better than they thought it would. Of course you need to have pre-ordered The 3rd Birthday to receive the voucher for it, but it will be featured on PSN a few days before it.
No word on how we get the code for Lightning's costume for The 3rd Birthday or a date, but we hope it'll be cleared up soon.