Edited Date/Time:
About halfway through this article.
"Youthstream will announce RedBud as host of the 2018 edition tomorrow morning and the standard has been set."
Says it will be announced tomorrow. Sorry if this is old news, hadn't seen any such confirmation previously.
http://racerxonline.com/2017/09/30/5-things-we-learned-motocross-of-nations-saturday