Conspiracy time!
With the "there's SO SO SO much more", why use three SOs? Here's my prediction: There's 3 new Green Day things that have yet to be announced.
In November/ December, we get Thing 1: 1972- an EP of 5 or 6 songs that are what the band initially worked on, this will include 1981. Chances are, this EP will follow some kind of loose narrative or so cohesion in some way.
In February-April sometime, we get a whole album of new songs, this is Thing 2. 13-18 tracks of whatever they've been working on recently, with the vim and vigour they got whilst recording 1972.
In May- August we get Thing 3: 20 Years of American Idiot, this will be huge and really catapult Green Day back into the mainstream, with us hardcore fans already very satiated. This will be similar to Dookie, and the Limited Edition vinyl set will have some Cigarettes and Valentines re-recordings for good measure.
Alongside the American Idiot celebration, Green Day also announce the "WIDE AWAKE" tour, starting in October, celebrating 30 years of Dookie, 20 years of American Idiot, 1972 and the new album. A real greatest hits and a look at their new stuff tour. This world tour will probably last October-February time.