Based on his shape and a semi-official leaked storyboard, I'd guess he's some kind of spitting lizard/toad that breathes fire and spits minicons.
Well, okay. Since you stated that Crazybolt is some kind of a lizard, then what kind of lizard to be exact? From what we already knew, Crazybolt first made his debut in Beast Wars Neo where he was a frilled dragon that turned into a human and he only spoke Japanese. But this version of Crazybolt, as we speak, will be English-speaking for sure. Judging by the storyboard, is it likely that he will eventually escape from the Autobots and join Steeljaw's team, or be captured like all the rest, no matter how powerful they are? I'm starting to get little tired of this cops-and-robbers storyline for this series. It's time for Hasbro to turn this series into a full-fledged war series during Season 2, since the majority of Transformers is war-themed. Don't get me wrong, though. I still love this series. It's just that I question the storyline for this series, that's all.
Since this is a sequel to Transformers: Prime, do you still remember Airachnid? Airachnid is a humanoid spider that can turn into a helicopter. Does that really mean that all animal-based Transformers that can turn into vehicles, including Crazybolt, are descended from her?