Tim,
The specs are phenominal. But for me the realisation sinks in when I look at my lenses. All 6 of them I have are DX and with a DX lens its only a 5-6MP camera. So that means getting a whole new set of glass!
The flip side is the high ISO capabilities. For the green I can see this being massively beneficial, natural light shots should be much better.
If I was you I'd leave it a few months. First email I've had wants £1 short of £2k. I'd wait a bit for it to come down, which it will, and you'll have to wait for a Nexus housing anyway
Rob