I doubt Marion gets moved until the trade deadline, if he gets moved at all. it will all depend on how the Heat are doing. If they are sub .500 and Dwade is injured, no doubt Marion will be moved, and probably to a contender (like the Cavs) for an expiring contract and some goodies -- JJ Hickson was a good suggestion. Another possibility would be LA which could part with Odom + goodies.
I doubt he goes to Minny or Portland -- there is little chance that those teams would be able to resign Marion after the season, so they would be giving up a lot to rent a player for a few months. FWIW, as much as I like the Blazers, I think they are over-rated and will fall to earth shortly, and I think Marion wants to be on a championship contender, which Portland is not.