It seems that the HX won't be the only Hummer vehicle featured in Transformers 2. At the Cinema Expo International 2008 in Amsterdam, GM shelled out some bucks for a big platform that includes the H3 logo, the Transformers logo and dual black H3's to go along with it all.
If you recall, Ratchet from the first Transformers was a tweaked Hummer H2. Could Ratchet be getting a upgrade? Or will the Hummer H3 serve as a completely new Transformer? GM might just using the black H3s because it doesn't have enough spare Hummer HX concepts for a measly movie expo. Only time will tell.