This information can be fetched from the browser, IP or mobile location services.
I'm only interested in country and state.
Country and state should have the appropriate html microdata attributed: http://www.html-5.com/microdata/rich-snippets/addresses/
I would like the addon to be publicly released for the XenForo community to use. (free or commercially)
I need this functionality to be developed within the near future, so please respond if your time schedule allows for this project.