The latest issue of Billboard magazine has reports that the label is shipping 1.1 million CDs for the first week launch on November 5th. And there current estimate is 750,000k units - including digital sales.
Labels try and predict safely. It could be higher, it could be lower. For example, the movie studio that released Gravity expected first week to be around $30 million and it ended up with nearly $55 million due to insane word of mouth buzz. If his SNL performances are big, that could also help.