the Vehicons
Though they technically don't exist yet, several Vehicons have appeared in the present, on earth, along with the other Transformer factions duking it out over the fate of Fortress Maximus. It is presumed that they came back either alongside the others (if they're from the future) or with Optimus Primal somehow. The trick, though, is that they're not all necessarily evil.
You see, three of them are no longer true Vehicons, but bear the Autobot symbol. This may be because they've just been reprogrammed to work with the Autobots instead of with their former master, the Beast Machines era Megatron - or they may have been given true sparks by Optimus Prime himself. Of course, Obsidian is still his old, nasty self. Anyhow, those Vehicons currently on earth include:
Known Vehicons
Megabolt: a massive Vehicon warrior from the future, Megabolt is an extremely powerful villain bent on universal conquest - he's already seized several worlds on his own. Of course, for his own purposes, he is aiding Megatron in the theft of Fortress Maxmius for the time being. Megabolt comes in Classic and Saga styles!
Obsidian: originally a Maximal, Obsidian was converted into a Vehicon after he decided to embrace Megatron's (the 'Beast Machines' one, anyway) cause. After that villain fell in battle, Obsidian wound up in the past, and now serves a different villain named Megatron...! Obsidian comes in Classic and Saga styles!
Coming soon: Mirage GT, Nightcruz, and Scavenger!