It was originally solicited to come out in December, two months after issue 1.

But Sandman Overture #2 by Neil Gaiman and JH Williams III was late and was resolicited to come out in February.

Then it slipped into the first week of March.

Now it has slipped into the last week of March. 26th of March 2014.

It could get later of course. I think it should come out every year in September month to boost DC's numbers, with maybe a surprise issue one year ahead of the others.

You could schedule it for three Septembers and a January.