It has been going US, France, US, UK, US there is a slight chance for it to be in a different country such as Canada (wink,wink)(come to Vancouver) but most likely to be held in one of the European countries.
I feel like Minecon 2017 or 2018 should be held outside of the US or Europe. Yeah, a lot of people live there but for people on the other side of the world, travel is difficult. If it was to be held in Australia both people there and in New Zealand wouldn't have to travel as far. Melbourne, Canberra or Sydney would be great places to hold Minecon. There is no way I would be able to go to Europe or the US just for Minecon.