Who bought him is a secret, it seems. Pointing towards the Dubai World Cup with ultimate goal of standing him at stud.
http://www.bloodhorse.com/horse-racing/articles/81884/ron-the-greek-sold-to-overseas-interests (http://www.bloodhorse.com/horse-racing/articles/81884/ron-the-greek-sold-to-overseas-interests)
If he runs again (DWC or other), we will likely get the answer as to the who.