I suppose the kayaks are from an edited-out Roadblock, but that's for another thread...
We've seen some form of the Intersection before, remember the Viking ships in Sweden?
Since this is in the middle of a leg, I suppose the way teams pair up would be in the order they arrive, barring alliance moves. We can safely say that Rob/Kim and Tyler/James arrive 1st/2nd (doesn't matter which since working as a team means they'd depart in joint 1st anyway), Dustin/Kandice arrive 3rd and are thus forced to work with the 'six', and of course the Back Pack pull up the rear.
And no way Dustin/Kandice and Erwin/Godwin are going to lose to David/Mary and Lyn/Karlyn. If the Chos are still on the whole alliance thing and are devious enough, they can always wait for the rest of their alliance two steps from task completion and hold up Dustin/Kandice!