Director Michael Bay has revealed that the sequel to Transformers will feature lot of new, unique robots. Bay wrote on his personal web site:
Transformers 2 will be coming soon. The new robots are really really unique and there are a lot of them this time.
Well before the first movie hit theaters, the film makers let slip that that Dinobots and Constructicons may be some of the groups that will appear in a potential sequel. A short video clip found on www.sectorseven.org, (enter "codeblack," click on the red hard drive, choose the N.B.E. 08 file) shows Dinobots leader Grimlock in his T-Rex form, crushing everything on his path. The excavator on the left could be Scavenger, from the Constructicons.
Futhermore, producer Tom DeSanto said in an interview that he has "a very cool idea on how to intro the Dinobots and Constructicons."
Considering the ending of the first movie, we are pretty sure that we'll get to see Shockwave and otherrobots that have survived at Cybertron. What Autobots and Decepticons characters would you like to see in Transformers 2?