(Click Here) The Allspark (Click Here)
ToyNewsInternational (Click Here) has posted some new photos for the upcoming G.I.Joe Retaliation line with all new figures set to release soon including the HISS-Tank based off of Shockwave. The Allspark (Click Here) says it's going to be a SDCC Exclusive like the previous Starscream Jet.
As you can see, the toy has Purple armor, carries Decepticon Logos, and has a highly detailed turret similar to Decepticon Shockwave from Generation 1. Most likely it will not Transform but it will work with other G.I.Joe figures