There were doubters at first, but KyoAni seems to have another hit on its hands in Hyouka. It started late in April, but Hyouka has already shown enough popularity on 2channel to bring it up into the same range as the other most popular anime of the season: Accel World, Saki, and Haiyore! Nyaruko-san.
There are not many featured seiyuu yet -- only four -- but I expect that to change, since a long list of top seiyuu has been published. More to come.
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Some people find Satou Satomi's performance too reminiscent of her voice in K-On (as Ritsu), but I'm liking what she's doing with Eru. Sakaguchi Daisuke is giving me a more congenial version of his Sunohara character from Clannad. Nakamura Yuuichi gives us his own twist on a character rather similar to that of his friend Sugita Tomokazu in Haruhi (Kyon).
But most of all, I am bowled over by Kayano Ai in episode 2 as Mayaka. Now, that's voice-acting: vivid, real, and matched to the character.