things appear twice because they are mixing pieces of songs together. if you saw them live you know what im talkign about.
people unfamiliar with this genre should know that this is a continuous mix, no breaks. ive heard most of this and its genious, breathes new life into old songs. its basicly like having daft punk remix all their songs. i listen to it more than the album.
also i doubt they will do another discovery style cd. i could be wrong but im willing to bet the heavy sampling ate up a ton of the royalties they could have made.