So I noticed something.
The special medley
from the 7th anniversary live's tracklist is:
-Furufuru future [recently released as DLC]
-Mahou wo Kakete [recently released as DLC]
-Kimi wa Melody [still not DLC yet, was in Shiny Festa]
-Brand New Day [DLC]
-Watashi wa Idol [latest DLC]
-Do-Dai [Standard in imas2]
-Town [idk what to classify this as]
-My Song [Standard]
-Flower Girl [has never been in any game]
-Little Match Girl [DLC/standard]
-arcadia [same as flower girl]
-Go my way [standard]
seeing a pattern? The vast majority of the songs were either included in the game or recently released as DLC right after the concert. Maybe that's a way to predict what songs will be future DLC? I dunno, it's interesting either way.
idk it probably doesn't mean anything but I would be willing to bet on Kimi wa Melody as DLC...