Tupac's hologram on tour? Why not Presley? What implications for IP lawyers?

http://legalblogwatch.typepad.com/legal_blog_watch/2012/04/at-the-recentcoachella-festival-fans-of-the-latetupac-shakur-fans-received-an-amazing-treat-when-his-hologram-performed-live.html

What is a hologram, you ask?

http://en.wikipedia.org/wiki/Holography