Atlus just announced that Hatsune Miku, the vocaloid that SEGA can’t stop making rhythm games of, is going to appear in upcoming DLC for Persona 4: Dancing All Night. She will be dancing to “Heaven feat. Hatsune Miku (ATOLS Remix)”, seemingly based on the song of the same name from Persona 4.
The DLC will be released next month in Japan. You can find screenshots and artwork for it below. And remember: this is canon.