If Irrational Games' last effort was anything to go by, Bioshock Infinite is going to be one the biggest and best games of the year. In this trailer you can see gameplay footage, and Ken Levine is also on-hand to discuss a new enemy, the Motorised Patriot. Described as a "clockwork terminator" by one designer, this is a chance to take a look at the one of the new breed of opponents from one of 2012's most wanted.