The 4th and 5th additional DLC "Additional Song Pack" of "Hatsune Miku Project DIVA MEGA39's" will be delivered on April 13. The sixth one is scheduled for May 13: Japanese games news
初音未來Project DIVA MEGA39's 官方網站
FIGURIZM "Hatsune Miku" Project DIVA MEGA39's "Hatsune Miku - Catch the Wave" | Ultra Tokyo Connection
初音未來Project Diva Mega39's》發售日決定過百首歌有排玩
Hatsune Miku: Project DIVA Future Tone Mega Mix Encore Pack (Chinese Ver.)