I think Dupuis is going to stay. He is on record numerous times saying his family loves it here and he would prefer to stay. He is the type of player that would take the home town discount, but he isn't going to take a slap in the face lowball offer either. Dupuis's numbers have increased every year (went down 1 pt from 09-10 to 10-11). Has he thrived playing with Crosby? Absolutely. I think he has learned a lot and been able to improve his game, but he is not dependent on Sid. He put up his best numbers last year, when Sid only played 22 games. He is the most versatile of the Pens, being a top 6 forward, top PK guy, has the speed for the system, meshes with Sid, etc. He is also a late bloomer, so while he is 34, I think Shero would not have as much of an issue signing him for 4 years.
My guesses are: If he gets 4 years, he gets between 3-3.25mil a season. If Shero will only go 3 years, he gets 3.5-3.75mil a season. Highest is 3 years, 12mil total, but very hesitant to go that high. He deserves to double his current 1.5mil salary, at a minimum.