He is the first (Animated) character to be based off of an remolded repaint of an cybertron figure based of an Beast Wars character. Wow, thats a mouthfull!.
Like the Rattrap before him, he has buck-teeth, his bottom incisors only show up when he talks though.
Despite being based on Rattrap, however, his name is apparently different because he isn't actually a rat. It also appears to be a combination of Rattrap's English name Rattrap and his Japanese name Rattle.
Rattletrap is an obvious homage to Rattrap from Beast Wars, though he isn't quite as humorous or sarcastic, maybe it was his evil twin.
Also unlike the original, he appears to be much more willing to work with certain Decepticons. TRAITOR!!!
It's unclear what Rattletrap even transforms into.