It isn't until October, but a Symphogear concert featuring Mizuki Nana, Takagaki Ayahi, and Yuuki Aoi is scheduled for October 6.
In Ao-chan's 2channel thread, a couple of posters have described it as a "public execution" for her. Mizuki Nana is the top seiyuu singer, and Takagaki Ayahi has a degree in vocal music and is another top seiyuu singer. How can Ao-chan match those two?
I would have agreed last week, but after hearing her album -- and seeing that she has six more months to improve -- I think they will find ways to make her voice work.
I've listened to Petit Pas a dozen times or so, and it just doesn't get old. I hear more every time. Good music, and an amazingly good job by Ao-chan.
I've found a Japanese review of the album, and it is highly positive. The writer emphasizes that Ao-chan brings her seiyuu skills to the project, making each song a little drama, and creating a character in each one.
In "Baby Dolly Alice," for example, you really hear the snap in Ao-chan's voice, as she curls her voice around the super-cutesy character.
In the announcement of the concert, Yuuki Aoi's name is placed first, before even Nana-chan or Ayahi. Iguchi Yuka will also be part of the show.
Maybe it won't be quite the public execution it would have been a few months ago.