If they're gonna play all their songs, I can see some Stargazer coming into play then!
Though if they were gonna go the solo performance route:
Yuka - Stargazer
Sayaka - Mushi no Ballad
Sae - Kiseki wa Ma ni Awanai (solo vocals with the dancers)
Umechan - Endroll (solo vocals with the dancers)
OR, the dancers might end up singing and/or having a pure danceoff or something. AKB vs new DiVA dance showdown?!