Michael is on there now:
MICHAEL KISKE RETURNS TO AVANTASIA‏
After Bob Catley (Magnum), Eric Singer (KISS), Alex Holzwarth (Rhapsody Of Fire), Klaus Meine (Scorpions), Jorn Lande (Masterplan) and Tim "Ripper" Owens (ex-Judas Priest) another voice can be announced for the next Avantasia album: Ex-Helloween voice Michael Kiske who has appeared on every Avantasia album so far, even already on the two early classics "The Metal Opera" has been back in the studio to sing his parts for the next journey to Avantasia.
Tobias: "Michael's voice and singing have had a huge influence on me when I was young. Helloween's "Eagle Fly Free" lit the spark for me back then, it made me want to become a singer at age 12. Michael appears on several songs, two are fast and anthemic tunes, my personal "Eagle-Fly-Frees" if you want. Crystal clear and high singing. If up-tempo music sounds like that, I don't get tired of it. And still it is not a copy of early Helloween or early Avantasia. It's great to have Michael sing those kinds of tunes. He's a good guy! Great job, great voice!"