Found one on Amazon and ordered it. http://www.amazon.com/gp/product/B00XGOYVRA?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00 Black with silver modern buckle.
I was in the Apple Store a couple of days ago and asked if they had any idea when the modern buckle bands would be available. The genius told me even the store employees didn't know, and some of them were waiting for it as well.
Is it true that the modern buckle only comes in the 38mm size? If so that's pretty disappointing. It's a nice looking band.