I think they are known to be similar to Sheen Supremes and the type of tube is pure speculation at this point. But, I can tell you I won't buy it if it ain't in the bullet shape and its a greasy mess like those Sheen Supreme lippies. If I want gloss, I will go with the CSG. A true liquid lipstick, that I could get behind but I don't think MAC has gotten a good formula like that.
Plus, as I have said before, those tube shaped lip containers malfunction, they don't let you roll the lipstick back down so you either have to push it back in with your finger or let the top get squished...