Reading some quotes by Doc and players indicates that this rumor is just that...a rumor. Then again, what is a high ranking NBA official? I love anonymous sources.
"Some people think it's a foregone conclusion," coach Doc Rivers said of Marbury coming to the Celtics. "Honestly, I hope it is. But until it is, we will wait and see. Once upon a time he was a talented player. We hope he can help us. So we'll see." Boston Globe
Said Ray Allen: "Stephon has been an extraordinary talent during his career. He definitely can help us. It will be interesting when he gets here. I know what it was like with me making the adjustment here, Kevin (Garnett) making the adjustment, even Paul (Pierce) making the adjustment. Stephon has been a franchise player and if he can make the adjustment to the situation, he can definitely help us." Boston Globe
If the plan is to release him, everyone in the organization is going to great lengths to mask the fact.