Adamant found this picture of an autograph sheet posted on 2ch, and it seems to give us quite a bit of information! According to 2ch the pic got taken down shortly after, probably because they realized it contains spoilers.

1. Quilladin is coming, and its seiyu is presumably female (first name seems to end with “-ko”)

2. Mika Kanai appears to be filling in for Mariya Ise during her maternity leave, and she’s also the voice actress of Serena’s Eevee!

3. Talonflame will be voiced by Kiyotaka Furushima!