According to an Eastern Conference source, the most likely scenario would be to work a three-way deal with a team that has cap space. Look for Charlotte, New Orleans, or Atlanta to possibly become involved, with Walker being shipped to a contending team in the East. The team with cap space would receive a player of equal value and Boston would end up with a draft choice, so as not to take on more salary and head into luxury-tax territory.
There are also rumors circulating that Marcus Banks is back on the block. Orien Greene will likely get a contract (1 year with a 2nd year team option).