I imagine this means that they are going to aggressively try to trade Mike Miller for the rest of the season. Try to get a big man, or, more likely a PG upgrade in the process. And if they can't move M.Miller, they'll probably amnesty him next summer.
Also, I think by using the MLE ... Miami has limited the amount they can offer Mario Chalmers quite significantly. Something to keep an eye. Chalmers would be an unfortunate loss for Miami. One of the few quality role players on that roster.