It's going to be under very strictly-enforced boxing rules. I'm predicting the fight may not be as exciting as anticipated, and am betting that Floyd will coast to a victory. I actually hope that Conor can KO him, because that's his only chance of winning, but I seriously doubt that will happen.
If anyone thinks Conor is behaving badly, Floyd Mayweather has always acted like an idiot and has spouted racist nonsense to/about others, and I'm sure it's more his true nature in real life than it is for Conor. If it were a boxing vs MMA fight, Conor would win very quickly, but Conor has never had a professional boxing match, while Floyd has never lost for 20+ years against the best in his division; he's not THAT old, and I'm certain he can still handle Conor in a straight boxing match. Floyd would NEVER have agreed to a match outside of his comfort zone, that would introduce an unknown factor, skillset-wise, from his opponent.
Jim