Contract structure is like this:
Marleau: year 1) $8.5M 2) $6 mil. 3) $4.25
I doubt he'll be bought out as well, there isn't much of cap relief in doing so. Don't think they'll do it to a classy veteran, but this is Leaf land and a lot can happen in 3 years. For all we know he could become the next Larry Murphy and get driven out of town at that time forcing a buy out. They can't send him to the minors, but they can certainly kick him off the team.