Bemaniwiki's got these added songs, so maybe they've already unlocked nearly everything there is to offer?
グレード 曲名 アーティスト LEVEL NOTE
BA ADV EX BA ADV EX
Bronze 隠し曲
Fox Queen's Paradise nanako 4 7 8 317 404 611
Lion Russian Snowy Dance Mutsuhiko Izumi 5 8 10 376 574 662
Silver 隠し曲
Rabbit ECO FIGHTER 入尾信充 3 5 8 182 381 535
Fox 恋のメリーゴーランド 森野くま子 5 7 8 330 502 647
Wolf sweet angel 古川もとあき 4 6 9 210 370 633
Lion AREA 51 96 409 562 719
Gold 隠し曲
Squirrel INVISIBLE WORLD SILKY F 2 7 8 230 459 630
Rabbit Shining Star Sota Fujimori feat.Nagisa 4 6 8 279 401 591
Ocelot coming true GUHROOVY Vs.L.E.D 5 7 9 341 568 745
Oddly, Good-bye Chalon still hasn't shown up despite being confirmed on the Ripples OST.
The song list was kind of small, so I've already managed to build a wiki page for it over on our forums, heh:
Jubeat Ripples