For what it's worth McCartney was #1 on Amazon today (chart changes hourly) after his appearance on the Jimmy Fallon show last night. At the moment he is #2, but his album does not drop for a week. Miley Cyrus is #1, but her album hit the stores today.
From past experiance an album charting this high a week before it's release is a great sign. The album has a legit chart to enter the U.S.chart at #1. It's biggest competition in the United States will be from Pearl Jam.