Official website open:
http://karneval-anime.com/
The staff I reposted from 2ch earlier is confirmed. The drama CD cast is also not only being kept for the main three - we're still getting Endou Aya (Tsukumo), Ono Daisuke (Hirato), Nakamura Yuuichi (Jiki), Yusa Kouji (Tsukitachi) and Hirakawa Daisuke (Akari). The character page gives us a pretty good idea of the look - I honestly think most do look pretty well adapted. All that's left is waiting for the PV bundled with the latest manga volume to surface...
But mehhhh, Tsukitachi looks kinda bad. WHY HIM. :|