The book in the set says "yes" (a nice book at that, as is the box). I have to say the opposite. The cds are nicely packaged but do not contain any of the bonus tracks on the previous issues. The version of "Double Fantasy" is only the single disc. Essentially, you are paying $150+ for 13 bonus tracks and a nice box.
These bonus ("unreleased" material) tracks are very similar to those previously available on other packages (such as "Anthology"). The content of the disc "singles" is available in all the new compilation packages, with the exception of "Move over Ms. L" (available on the old "Collection" cd). Strangely enough, "Do the Oz" (previously a bonus track) is now missing from all the packages.
If you already have a copy of the 1991 LENNON box set, it contains all the original (non remastered) mixes. It also has John Lennon's final performances with Elton John and all of his "Double Fantasy"/"Milk and Honey" songs collected on one disc.
I have had time now to listen to three versions of the "Plastic Ono Band" album.
The original British cd (1990), the remastered cd with bonus tracks (2000) and the 2010 remaster. On the original cd and and the new cd, John's voice is further in the background with the new cds being louder and "brighter" (more high end) than the 1990 issue. The remaster from 2000 has a much more even balance of music and vocals with his voice slightly more forward in the mix. In both the 1990 and 2010 versions, the vocals almost seem to take second place to the music. This is not the case with the 2000 issue. As to the bonus tracks intruding on the 2000 version, there is a fairly large gap between the end of the album and the extra songs. This easily allows you listen to them or to turn off the cd, as you wish.