So whats the story gonna be like? "Yeah after doing our own thing we really wanted to get on the tour again."
Just kidding, no one cares about the story.
the whole story in ssx (2012) was that the ssx competition had faded away and lost sponsors. the deadly descents were done to gain the global audience and sponsors again (by defeating griff and showing the ssx team is where it's at).
it makes perfect sense that the next stage in the story would be the new ssx tournament. i feel like a new ssx tournament/mountain could be too big for an expansion though, and worthy of its own game. sooo, maybe the dlc will just be tracks with no story at all.