All-Star Cast: See the Touhou Wiki entry for a complete list and links to their Anime News Network articles. Notably, Aki Toyosaki (as Suika) was the least well-known member of the cast at the time the first episode was released, about four months before her breakout role as Yui in K-On!.
This is more than likely the real reason for the delays—having to pay to use these big names probably isn't cheap as well has having having the time to do voice-work for a work like this.
No Export for You: There are English subtitles, thanks in part to KirbyM. So, for all you English-speaking fans that want to support MAIKAZE and hopefully push the second and third episodes out of Development Hell... good luck with that. Almost none of the retailers who stock the first disc ship internationally.