As of just a few days ago, the way the proposals were set up, it appeared certain the Heat would have to use their amnesty clause on (Mike) Miller immediately just so they could add to their roster.

According to league sources, the Heat had planned to waive Miller and had let him know through back channels so he could prepare. This information was not all that secret — teams in need of shooters were already doing background research on Miller and considering bringing him in. Miller had a number of suitors when he was a free agent a year ago, including the Chicago Bulls.

via Brian Windhorst of ESPN