SonGokuGT over on our forum pointed us to bluray.com which notes that Toei has gone (at least for now) with Blu-ray as their preferred high-definition home format:

Toei International has announced that they are planning to release ‘Clannad’ for Blu-ray on March 7th in Japan. This will be the first Blu-ray release for the studio, and adds yet another strong content provider to the Japanese Blu-ray market. The release will make use of a new HD master which is said to have a “beautiful image which cannot be reproduced with DVD”.