The Fiesta Red Jag-Stang prototype is up for auction at Juliens at this url:
https://www.julienslive.com/m/lot-details/index/catalog/261/lot/102285
Blog Post with details: https://www.jag-stang.com/2018/05/fiesta-red-fender-jag-stang-prototype-up-for-auction/
Auction closes at 05/19/2018 10:00 AM EDT.
UPDATE
The auction has now closed with a winning bid well above the estimate.
Winning Bid: $93,750
UPDATE 2
It looks like the guitar has ended up at Fender HQ in Scottsdale, Arizona based on this instagram post by Brad Traweek.
https://www.instagram.com/p/BoIggI_hXZ5