Oho! The release date for the OP and ED have just come out on the singer
Ayako Ikeda's blog a short while ago.
It's coming out
29/8, as well as an image song that came about during the production of Dennou Coil - "Tabibito" (Traveller), released by Sony Music. The first press of it comes with an Oyaji mobile phone strap and a DVD with extra stuff on it.
I'm so dying to hear the full version of the ED, I've come to like it more than the OP now.