As with the OP, I think mingling through crowds and otherwise getting up and close with people would be a good idea. Make it more fluid and natural than Assassin's Creed though.
I'm kind of on the fence about multiplayer; on one hand, it'd be superbly cool to string together combat moves and have sweet chain moves from building to building. But it could also be unintuitive and clunky and detract from the single-player experience.
Other than that, get Brian Eno or Kraftwerk to do the theme (please?).
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