There are quite a few people who can do them actually, I feel like there must have been one thrown already in comp, but definitely X-Games well see them.
someone threw one at killy's dew tour but wiped out at the bottom. they landed it but then fell skiing away and up the next wall. it might have been dorey, not sure?
simon dumont has been working on them, the whole canadian pipe team has been working on them, and jossi wells did it in revolver so he might be throwing them in x games. i dont know if kevin rolland has tried yet...