Could this possibly be that Hulk sized secret at the end of Avengers: Age Of Ultron?  It COULD be, considering the first official look we’ve had at Ultron and The Vision have come from the premium Sideshow Collectibles releases.  Looks like Dr. Bruce Banner in his ‘other guy’ form is the newest figure:

This new figure from Sideshow Collectibles carries a Hulk-sized price tag, $599, and is expected to ship from the site in January 2015.  You can order it here.