Cabot Cliffs won the 2015 award because of the three real contenders, it was the only one in "America". Cape Wickham and Tara Iti will both have to pursue their claims in other venues, most of which don't offer a "Best New Course" award.
It remains to be seen if the magazines will consider the new course at Forest Dunes one course, or two, for all of their various awards. Ron Whitten was leaning toward it being two separate courses, in which case, I don't think it will win a Best New award ... but it might be the only course in history to finish in the top ten, twice!