I personally think Pavlik would vacate his titles, he does not strike me as the kind of guy that will hold any belts after a loss, even though its 10lbs over his natural weight. Bank on him vacating the 160lbs belts, moving up to the SMW division.
It would be a knock to Abraham's legacy if AA would fight and beat him. Same as when Abraham defeated Miranda in their second fight b/c Miranda was considered a left-over from Pavlik...
I can't see him losing to BHop. At the very least he wins a UD based on ring generalship, aggressiveness and punch output. Hopkins knocked Joe down with a jab in the first round and went on to lose the fight. Don't get me wrong, I love what Hopkins has done in his career, but I just dont think there is anything left in the tank.