Connor was definitely on a 27.5 Carbon Operator in that race. In the final part of the Australian DH season in like January of 2015 he rode a 650b Precept 200 mule bike to get used to the new wheel size. In April He showed up for the Port Angeles DH race in WA on a custom Carbon Operator with a modified rear triangle that accepted the bigger wheel. For the World Cup he rode the modified Carbon Operator, wasn't until the World Championships that he got the new Aluminum 27.5 operator.
Here is the Precept Mule Bike.
And here is the modified carbon Operator (notice the long ass chain stay).