I LOVE the touhou series (if you can't tell my by recent sigs... ^^\) and already plan to buy/watch this ASAP.
But what’s REALLY great : For a supposed doujin anime, they managed to get the SEIYUUS. Mai Nakahara as Reimu is damn unexpected for one. Rie Tanaka being Sakuya Izayoi is kind of understandable given her role as Suigintou in Rozen Maiden before. And with it, Touhou might go commercial. But whether it is a good news or not is still depending on how it will turn out in the end. But with the upcoming release of it - going to Comiket might worth SOMETHING after all!