The only date I can share is "mid-2013".
However, Intel themselves posted a launch date on the facebook site, but it is not listed in exact dates.. rather like a countdown timer...that doesn't actually count down.
Yes, I have these products, and yes, those are pictures I took, not press shots, so soon...but I cannot disclose exact details. In fact, I can't tell you anything about what goes into these boards, but I can tell you the chipset names, like Z87 H87, etc.
I don't have any NDA with Intel myself, but I have signed NDAs for every product I've shown in the last little while. All the pictures myself and other sites have shown are very much allowed, for the most part now. I've seen one or two with "restricted" details.
Anyway, a couple more unrelated pics:
http://img.techpowerup.org/130523/DSCF8759.jpg
http://img.techpowerup.org/130523/DSCF8774.jpg