Now that the 2018 Winter Olympics Host has been awarded to PyeongChang, the IOC has kicked off the 2020 bid process. By the Sept 1st deadline, here are you application cities:
The IOC will short list the application cities next year down into the candidate phase, where a evaluation committee will visit each city as the IOC voting members are forbidden to do so. The final election will be on September 7, 2013 in Buenos Aires.
Personally, I think it is between Rome and Istanbul.