They'll patch him up good as new. It's only flesh. It heals. Not like the damage caused to the brain. People tend to get a little over excited over flesh wounds. A fight should only be stopped on cuts when the blood effects eye sight.
I was planning on watching this one sometime this week but after seeing that maybe I won't. Got to admire Jack continuing with his head in two pieces but not sure I want to see it.
I didn't watch the fight as well, but I'm gonna watch at least the first part of (the cut happened in the seventh round).