Blimey guv, we never knew London had such a teeming underworld. In Gangs Of London you'll get more than 60 missions of shooting, tactical battles and driving.
There's a Story Mode, where you opt to be the next Kray-style kingpin, 1-5 man Gang Battles for nabbing territory from rival do-badders, and Free Roaming Mode for just being a right general pain in the 'arris.
The game is being developed by Sony's London studio, who also worked on The Getaway game, which shouldn't surprise you. It'll be released from prison this autumn.