It's possible. Dallas at #27 is reported to be enamored of Iupati. Another team could trade up to get ahead of them, or Dallas could trade up to make sure they get him. Although Green Bay seems to need OT help more than OG, they could take Iupati at #23.
I think that realistically the earliest Iupati might go is Pittsburgh at 18. If he gets past there, he could go to Cincinnati at #21. Andre Smith and Iupati could be a heck of a left side to run behind. But if he slips to 22, I could see some teams wanting to trade up.
Iupati might be worth taking at 22 for the Pats, but it all depends who is still on the board. He certainly helped himself a lot this week.