The seiyuu haven't been announced yet, so I'm going crazy figuring them out. Someone on kuroshitsuji said they were the same as the drama CD, but I'm not so sure. If they are, they got a lot better since, although I'm not still not completely sold on Ciel.
What do you think? Well, Sebastian definitely isn't Koyasu Takehito! He sounds a little like Miki Shin'ichirou, but isn't (probably). I think it might be a NeoRomance boy, but which one? As for Ciel... not sure. He sounds a little familiar, but I don't think he's Minagawa Junko, Kaida Yuki, Saiga Mitsuki or Paku Romi... None of the women that are skilled boys' roles, in other words. But hey, maybe it IS the CD cast. Maybe that's why they're so familiar.
Edit: 2ch are saying Sebastian is Ono Daisuke and Ciel is Sakamoto Maaya... Ah, really? They're saying it in betweeen FUJOSHIFUJOSHIKIMOIKIMOIFUJOSHI, so whatever. I think they might be right on the second one.
I love the bit with Tanaka at the beginning, showing they're going to keep the comedy. That's why I love the manga so much -- it really is perfectly balanced.
...I'm sorry. I don't think I'm going to stop talking about this anime/manga for a while.