The Playstation Magazine has your look at the penguin.
Batman: Arkham City is the upcoming sequel to action-adventure stealth video game Batman: Arkham Asylum, based on DC Comics' Batman, for PlayStation 3, Xbox 360, and Microsoft Windows. It is being developed by Rocksteady Studios and published by Warner Bros. Interactive Entertainment and DC Comics. The game was officially announced during the beginning of the 2010 Spike Video Game Awards and is scheduled to be released worldwide the week of October 18, 2011.
IGN had this to say:
In an article in the UK edition of PSM3 magazine, Rocksteady's Dax Ginn talks about how DC gave the developer a lot of latitude when it came to the characterisation of Batman's iconic rogues' gallery, and that while Penguin retains the squat silhouette of Oswald Cobblepot he's "a nastier piece of work."
It's a noticeable difference, with Penguin's effete cigarette holder replaced by a fat cigar and the monocle by a cracked bottle-end, which Ginn claims is "too dangerous to remove - but he likes it". He also appears to have some kind of voicebox surgically inserted into his throat - could this be a subtle anti-smoking message from Rocksteady?!
Whatever, the biggest and potentially most controversial difference is the portrayal of the Penguin as a cockney geezer. Held up within the Gotham City's Natural History Museum, the Penguin introduces himself to Batman "as something of a collector," in a brash London accent, which is a far cry from previous incarnations of Oswald Cobblepot we've seen.
The article also revealed some other interesting tweaks in Arkham City's gameplay. For starters, Batman will be able to perform multiple parries; in the first game thugs would obligingly attack Batman one-by-one instead of piling in, but in Arkham City the Dark Knight can parry up to three attacks at once.
Arkham Asylum's powerful Detective Mode will be restricted in the sequel too, so it can't be exploited in the same way as in the original. "If you turn it on," says Ginn, "you see the pertinent things, but other than that there's little detail, so there's no great advantage from just playing in detective mode."
Also, as befitting the world's greatest detective, Arkham City will feature more demanding puzzles for The Dark Knight to solve, rather than a series of trails for him to follow.