my twitter for the latest as I usually tweet things when I come across them and then update the blog later. Anyway read on for the latest news bits.
It was confirmed officially that Nana Mizuki (Tsubasa) will be singing the OP theme and Takagaki Ayahi (Chris) will be singing the ED theme for Symphogear G. Nana Mizuki's new single is set to be released on 7/31 as previously stated, and Takagaki Ayahi's new single will be released on 8/14. The ED theme single will have a special limited "anime version" for sale with specifically prepared Symphogear art included on the jacket cover. I will post links to pre-orders on CD Japan as they become available, for now only the OP theme single is up.
Secondly, for some time a rumor has been going around about "Super Heroine Chronicle" which is a video game name trademarked by Namco Bandai a few months ago. It was rumored to be a Super Robot Wars-esque game using magical girl / heroine characters. Symphogear was rumored to be included (with many other series) but today it was confirmed that the game will be released on PS3/Vita later this year and will include Symphogear in the roster. So far only Hibiki has been confirmed to have an appearance, but as more details arise we will surely see the roster expand.
Finally, an update on the Symphogear G website notes that the next issue of Megami Magazine, which goes on sale 5/30, will include an interview with Akifumi Kaneko the head writer and co-creator of Symphogear. I'm not sure how long it will be or what sort of details will be revealed, but I will keep my eye on any news that comes out around that time so check back.