Following a policy of purging near porn titles from the App Store to make the iPad a more family friendly device, Apple will also ban games with violent content. According to CNN, the removal may not occur in time for the iPad's release date this Friday - but will follow shortly thereafter:
I'm guessing the game based on the popular show Dexter won't make the cut as it has nearly everything described there. We may see an increase in titles with "cartoon" violence (would a cel-shaded Call of Duty pass?) - and like the porn purge, any violent titles which remain will likely see a huge increase in sales.