So Honeycomb should bring with it more new android market features: books, music and movies. My guess is that this will make its way to mobile phones in Gingerbread/Ice Cream (the Android 2.4 version) which will combine honeycomb with the mobile version of the android OS.
Android Market to Add Music, Movies, and Books [UPDATE: Books Already Active in Honeycomb] | Android Community
Android Market to Add Music, Movies, and Books [UPDATE: Books Already Active in Honeycomb] | Android Community