Firstly via Kevin I understand that Kansas City has launched a bid for 2016. The forward calendar now looks like this:

• 2012: Chicago (unopposed)
• 2013: San Antonio (and maybe Zagreb)
• 2014: London
• 2015: no one yet
• 2016: Kansas City
• 2017: Japan (and maybe New York, Moscow seems to have given up)

Secondly World SF News has an extended feature on the London site, courtesy of the Concatenation team.