I do think there is something to the timing of the Cs trade becoming "official" and George informing the Pacers he won't resign there. Its like Ainge contacted George's agent, told them he wants him, George then goes to Pacers and informs them of the news to help drive his price down...
George was reported to have said he was jealous of the chemistry the Celtics had this past season so there seemingly is some interest there.