DVD and Blu-ray coming 10/25/16
Kino Lorber will release Boy on a Dolphin on both DVD and Blu on October 25, 2016.
While the street date has been announced, as yet the discs are not available for pre-order and no details about prices, extras, etc., are known. But apparently the release itself and the date are definite. More will be posted once it's known.
Update with details: The release date has been confirmed. Prices are $19.99 for the DVD and $29.99 for the Blu. The only extras are theatrical trailers. The discs are or shortly will be available for pre-order.