This is just my thought but when they say "a double" album, I think what they might mean is that they have something like say, 100 minutes worth of new music in which case they could either release two 50 minute CD's (whether it be as a double disc set or as two single disc sets) or, what I think they will end up doing which is one 79 minute CD and the other 21 minutes (or so) of new music will be used as "B-side" type tracks for the singles. I would prefer the double disc set in the sense that it would be easier to replace down the line if something happened to my first copy of the music but as long as I got the music, I'd be happy!
John