Well, the original concept was that the Penguin was a short, rotund, long-nosed, waddling man in a tuxedo, so that he had a penguinlike appearance and seemed far more comical and harmless than the keen criminal mastermind he truly was. The character was inspired by the penguin mascot in a series of cigarette advertisements, IIRC.
I know. But there have been skinny Penguins before, and with the somewhat dark and gritty vibe they seem to be going for with Pattinson, I would be honestly surprised if this version of the Penguin was anything more than a bit chubby at most.