According to the information shared this would be a transformable Triple T vehicle (which Transformers character is still unknown) packed with a Ring-O Sargent Slaughter figure. Apparently mentioned by Sargent Slaughter himself during a convention. In any case, we suggest you to take this with a grain of salt until we get an official confirmation or images.
HissTank › G.I. Joe Retro Line › Rumor: Transformers Collaborative G.I Joe Triple-T With Sgt. Slaughter In The Works?