Del Rey should've released this series back in 2009.
What's the current situation?

The first chapter was published as a preview within another magazine (Faust I think that it was), remember, "1st chapter", not "first novel".

The novels are supposed to be published separately, but after that first chapter preview nothing has been officially stated, I have not seen the first novel anywhere nor any online orders for the novels. Also remember that contrary to popular belief these are 3 novels (which contain the whole 7 stories) and not 7 novels with 1 story each.