he will die.
He will be tortured, fed his own innards, burnt and then decapitated.
His head will be hung above the village entrance for everyone to laugh at.
The leftovers of his body will serve as a public toilet.
Eyes gauged out, flayed alive, bones grinded, hung on his own bowels, pour salt on every wound, lit him on fire, put out the fire by throwing him in steaming hot water, get him out again, cut out his heart and make him eat it.
Something like that, but I think I'm too soft on what he should actually get.
Yes he's going to die. Because the rules of manga clearly states that when one betrays the good guy, that man must die even if he repents. So it's too late to save Sasuke now.