It's just about 2 weeks away now. There should be about 75 racers starting in Banff and 15ish starting from the Mexican border. The big concern this year is with regard to snow in the north.
This picture was taken about a week or so ago up in Rocky Mountain National Park. This is not on the TD route but snow pack is about the same in the Canadian sections and into Colorado as far south as Boreas Pass (which is Breckenridge). Banff got more snow this morning. Some racers are actually talking about bringing along snowshoes and I think they're serious. Many sections are being re-routed due to the snow and some people are even changing their travel plans to now due a northbound race in hopes that conditions improve with the extra time.
This picture shows more images of the snow pack (10 days ago) from the Flathead Wilderness section of the route in the far north. Flathead is special place by itself. I believe it contains the largest population of carnivores in North America. No shortage of Grizzlies, mountain lion's, wolves, Black Bear, Lynx, etc. The snow looks to be a deal breaker this year I think.