Why would Paul McCartney only play one song? All other guest artists, Alicia Keyes, Sarah Mclaughlin, US, and most notably John Mayer all played more than one song. I could see Hey Jude in addition to his latest hit Dance Tonight as that's a pretty uptempo song, also it promotes his new album even more.
But yes that "outline" kinda does blow. It just tells us what we all want/rumor sites have reported.
-Brian
Have you seen how expensive he'll be...