It's already out. This time, the surgeon has no medical training! The premise is actually clever: the first movie is so sick and depraved, it inspires a lunatic to replicate it (but with more people!). One of the actresses from the first one plays herself...but she's snared into the real thing now.
It's apparently even uglier, more disgusting, and avoid-at-all-costs-able than the first.
P.S. I've never seen the first one, but I've read vivid descriptions and seen diagrams. I think I was a happier person before I knew all that.