I'd assume the missing tracks could be "Wagamama" and "Ai no Gundan", since they, as well as the other recent singles since their last album, need an album of their own to call home.
I'm looking forward to this album if it really is staying true to the remix/rearrangement promise, because I love the idea of remixes and modernizing classics with some new life. On the other hand, I'm not looking forward to the likely divisive reactions this album will undoubtedly create.
I'm sure there are already people who are against this on principle, plus there will definitely be genre/style biases in play (of which I'm admittedly guilty of myself).
If that track listing holds true, I'm definitely looking forward to the new versions of "I Wish", "The Manpower", and "RR21" , but on the other hand I'm nervous about what they would do with "Souda! We're Alive" and "The Peace". But no matter what, new perspectives on old works will be an interesting experience, and combined with the inclusion of newer songs this will be a great way to bridge the gap between past and present.
I'm confused by the inclusion of "Renai Hunter" and "One Two Three", considering those were already on the last album and already fit into the current musical style...unless they're being reworked specifically to replace the graduates with Sakura.