What resort and when? If it's a popular one, no chance. If there is lots of availability; maybe but chances are very very slim; I've never heard of this happening. When the front desk gets these types of questions, they will refer you to the vacation planning center phone number.
Wyndham is the developer/manager and lost a court case that resulted in them taking back some units in some resorts. These will likely be up for rental. Any upgrade via an exchange will likely come from this pool with an extra fee attached.
Sue