Nerf Dual Mag?

I've seen alot of pictures of the mysterious dual mag that are supposedly coming with the Stampede. Here are some pictures i found of the dual mag.

Nerf Stampede with a dual mag in right below the middle point of the picture (Click on pic' to enlarge) 

Blue Nerf Stampede (?) with the dual mag. You can also see the drum mag behind the dual mag. Maybe it's photo chopped.

One of the most solid proofs of this theory. 

The same picture without text.