Current Confirmed Character List (courtesy of RPGFan):

Mue (Spectral Souls)
Marie (Atelier Marie)
Roze (Mana Khemia 2)
Liliane (Mana Khemia 2)
Morrigan (Darkstalkers)
Felicia (Darkstalkers)
Demitri (Darkstalkers)
Etna (Disgaea)
Prinny (Disgaea)
Aurica (Ar tonelico)
Misha (Ar tonelico)
Shurelia (Ar tonelico)

Magazine Scans #1

Magazine Scans #2

Teaser Picture Credited to Kotaku. Scans credited to minato arisato.