Just got my Bumblebee in the mail, and the official images of the First Edition isn't entirely transformed properly. There is a swivelling shoulder joint that hides the wheels, but the Wave 1 Bumblebee definitely has a different neck and stomach. The arms and legs appear to be the same though... so maybe a slight redesign occurred after the First Edition moulds were created.
It's a damn fiddely toy though, so could do with a bit of simplification to make it less frustrating and more fun to play with.

If the Wave 1 figure does indeed come with two guns, it is one extra gun to the First Edition version... and would require remoulding of the engine block (as noted in the NYCC pics) because there is only room for one gun underneath, and not able to plug in on the engine block on the FE version.

(and mine came with 2 left thighs )