Finland is logical choiche. Toyota headquarter is in Nagoya, 11 km from the hotel I am living at the moment. Shortest flight from Nagoya to Europe is to Finland, 9 hours and you are in Helsinki. If Japanese want strong control, then it is the most logical option - direct flight every day with very good flight times. Toyota is so important for locals here that they just cannot give all the WRC team responsibility to Europeans. There will be strong Japanese involvement I belive (compared to Hyundai for example).