It would appear that they've gone back to the basic JBMD album, without the tracks added for the 1999 (UK)/2001 (US) remaster - "I Just Want You to Know" (a slight return/reprise of "Empty Pages") and "Sitting Here Thinking of My Love" - for the first disc. Does anyone know what the second disc is? From the track listing Amazon has put up, I'm guessing it's the Traffic Live album (ILPS 9142, if memory serves) that was originally shelved in favour of Welcome to the Canteen, from which a few tracks were culled and added to the '99 remaster, now here in its entirety. If so, it looks promising, and I can't say I'll miss the two studio cuts much, as they really added nothing to the original album.
The Traffic Live November'70 album (ILPS 9142) was recorded over 18/19 November 1970. Tracks were: Who knows what ... ; Glad; Pearly Queen; 40,000 Headmen; Dear Mr F; Can't find my way home. The bonus CD is from those shows - different selection!