Apparently, this is the source. I looked for it because I was skeptical of it being photoshopped or not… but it seems to be real. Apparently, a Blizzard employee set it up. Not sure about the legitimacy of the source though, but whatever.

Also, it has a higher resolution version of the image:

Doritos truck is on it's way to it's destination, suddenly a pink mini car with bunny decals stop the truck and a gremlin D.Va jumps out with a handgun
"Hand over all the Doritos and no one gets hurt!"