No one knows that, but I bet there will be.
Well.... i quiet dont know but maybe because they know that they will loose if they faced them one on one pls if u have a better answer dont hesitate just write it. Hope it satisfies you. XD
for autobots, i think everyone from transformers 2 except Jetfire and for decepticons, i think megatron, starscream,some decepticon minions,and soundwave.
transformers autobots optimus prime,bumblebee,ironhide,ratchet,rc twins,Mudflap and Skids,dale jr,hot rod,sideswipe,dinobots transformers decepticons megatron,starscream,shockwave,soundwave,devastator,
no but some decepticions come back to life by unicorns powers and weapons in transformers 4 like megatron who turns to galvatron and unicorns menions help galvatron and unicorn fight the autobots again so watch transformers 4 to see who wins or see if its not over yet but remember its between some new autobots and old autobots and the new decepticions
soundwave,
The new decepticons are as follows: Crankcase Laserbeak Soundwave (car form) Protoforms
There are new Decepticons: Shockwave, Laserbeak, Soundwave (not the one in space), Driller, Igor, Crankcase, Hatchet, Crowbar. Returning Decepticons: Megatron, Starscream, Long Haul, Scalpel, Barricade. There are new Autobots: Brains, Sentinel Prime (Turns bad), Dino, Que/Wheeljack, Roadbuster, Leadfoot/Target, Topspin, Mirage. Returning Autobots: Optimus Prime, Bumblebee, Ironhide (Dies), Ratchet, Sideswipe, Wheelie.
The Fallen, through Megatron.
Transformers (2007) will have 2 sequels the second sequel (Transformers Revenge of the fallen) Will be released in 2009 and include the following robots: Optimus prime, Bumbleebee, Ironhide, Ratchet, Jazz, Arcee, Wheels, Sideswipe, Skids, Jetfire, Jolt and possibly Springer on the autobot side however jetfire will start off as a decepticon! Decepticons include Starscream, Barricade, Soundwave, Ravage, Scorponok, Deadend, Megatron, Alice (Not a joke she is a decepticon) and the constructicons: Scavenger, Scrapper, Hook, Longhaul, Mixmaster, Gravedigger, Roadhauler, Hightower, Bonerunner (Bonechrushers new namesake) It will also include the Fallen a evil transformer who was one of the original thirteen transformers. He betrayed god (Primus) and went to the devil (Unicron) however due to the mighty powers of Vector prime, Omega supreme, Primus and the autobots they managed to trick him and unicron into a black hole (Or Black Void) The fallen vowed to escape and take vengance upon the autobots who tricked him. He will appear in Transformers revenge of the fallen and will be released from the black hole by the decepticons who work with the fallen to attack the autobots who are forced to fight the Fallen and stop him releasing his master unicron! Transformers 3 will be released on 27th June 2011 and will include all the autobots and decepticons at war (Picture a billion decepticons attacking 50 autobots) And they will have to face off against Unicron before they can finally save cybertron!
There are new Decepticons: Shockwave, Laserbeak, Soundwave (not the one in space), Driller, Igor, Crankcase, Hatchet, Crowbar. Returning Decepticons: Megatron, Starscream, Long Haul, Scalpel, Barricade. There are new Autobots: Brains, Sentinel Prime (Turns bad), Dino, Que/Wheeljack, Roadbuster, Leadfoot/Target, Topspin, Mirage. Returning Autobots: Optimus Prime, Bumblebee, Ironhide (Dies), Ratchet, Sideswipe, Wheelie.
Yes, Bay has confirmed of making another transformers movie but it's unknown what the cast is going to be or the new decepticons yet.
he retreated to cybertron to breed a new army of decepticons