They might make it a 5 rounder....so the men get a 'main event' as well
Considering who these men are it'd be foolish for the UFC to make it a 3-rounder IMO.
Mind you Hendo will fall to pieces if it's 5 rounds. Gasses most of the time anyway, ****ed against Shogun, and with a massive hiatus (even if he'd returned for the Jones fight it'd been a long lay-off) and at his age he'll struggle IMO.
It's an odd matchup to consider anyway, Machida fights usually are. I still fancy Hendo to time Lyoto with a right hand as Shogun did in their 2nd fight. Even now I don't fancy Machida's awkward and varied striking to take Hendo out; guys chin is undentable.