I placed my order, money up, with my local Nikon dealer in January, not the 6th, but not long thereafter. There were three ahead of me on the dealer's D4 list, at the time, an NPS order, an order paid in full since October 2011, and a 6 January order by a local pro, not an NPS order. All were paid order. The first three came in in late March/early April. The dealer has not received a D4 since then. Yesterday (19 June), the dealer called to say that mine was ready for delivery, hopefully this week.
Six months seems like a long time, especially for a paid order, but this has been a very unusual model introduction. I don't think Nikon anticipated such demand for the camera. It is not a quantum leap, like the D3 was, or even a significant improvement in performance, like the D3s, although there are some great improvements in still photography performance, and video performance is apparently a major improvement, for those so inclined. Still, with what I understand to have been a 5,000 unit introduction, immediately absorbed, and then almost nothing until Nikon could punch out some more, and with a clamoring demand in the interim, it's been very different this time.
Many pros seem to be inclined to the D800/E, and the delivery of those seems to have been a little more steady, but the D4 intro, to me, has been an enigma.
Well, hopefully mine is on its way, and it may travel with me to the North Carolina mountains on Saturday. Otherwist, FedEx, stand by.