I had ordered set 7598, Pizza Planet Truck Rescue, on May 3rd and it arrived yesterday (minifigures up at the store by the way). I was surprised to see that I received one of the LEGO Star Wars sticker sheets!
The pictures on the interwebs have been too small to read the captions, but there is a fairly sizable sticker of the white Boba Fett variant. The caption reads 'concept art Boba Fett'. So we reverse our position once again...it was a tribute to Ralph McQuarrie's concept sketch for the character!