In SharePoint 2013 Preview there is a new type of field: GeoLocation which is, like the old SPUrlField, a pair of values. The geolocation is described as longitude and latitude. Unfortunately you can’t add this field in list settings. You have to create this in code. In the provided link you can find the code C# code which uses the Client Object Model. In another link you can find an example how to create the geolocation file using Server Object Model (in FeatureActivated EventReceiver).