According to Wikipedia, this Season spans 35,000 miles, the same as last season. While I find it highly unlikely that this race could have as long of a route, it got me thinking.
We have several days between leg 7 in Rome and leg 10 in Seville. We also know that a fourth "mystery" continent was visited at some point on the race. From this information, I am suspecting that a country in West Africa was visited for two legs, with a possible NEL/TBC in the middle.
Also, the press release stated that there will be nine countries visited, of which we only currently know six: China, Malaysia, Sri Lanka, Italy, Spain, and USA. The remaining three must each have their own leg, or one leg must visit two countries. My guess for the leg 11 is probably somewhere in west Europe, such as England/Wales/France/etc.
All of this is just speculation. Feel free to discuss.