Given Gun Media's prior stance on the subject, it's unlikely the skin will be made for purchase from the general public, either. Of course, gamers who hadn't bought into the Kickstarter tiers have been quite happy to download the skin while it's available, as it's not likely that Sony or Microsoft will make the same mistake again.
Gun Media promised that the Tom Savini design would never become publicly available, and it's unfortunate that a game which has been plagued by many glitches and issues from the start has also been unable to protect backer-exclusive content meant for those who supported it from the beginning.