Looks like three so far, one is being sold on eBay. Won't be long to see some threads about banding. That seems to be the complaint du jour for new cameras over there.
There's one in Toronto's Craig's list asking $2500. Yikes! I'm interested, but I want to read what ordinary hobbiests think of it. My primary interest is in using it for travel. I'd like a smaller body but with nice lenses for low light stuff like churches, castles ruins, etc. I have the 5N and sold my Nikon D7000 after using it for a few weeks. No regrets here. I also got the Voigtlander 35mm f/1.4 Nocton; love it. The removable EVF and flash are proving to be tedious so I don't use them when I actually should.
I'm afraid if I put my hands on one at our local photo shop I'll be a goner.
I listed my A850 for trade for an NEX 7 on the forums here. I figure someone isn't going to like it once they get it and might wanna go FF instead. I LOVE the A850, but really want something smaller.