My turn

Ordered 9th Jan and this morning it's changed to "Preparing for shipment", hurray!
From my perspective I think the current iMac's availability problems stem not only from production issues, but also from a genuinely high demand. I'm upgrading from a 2009 iMac, and none of the interim releases interested me. However the fusion drive and sharp design make it a no-brainer.
My local Apple store (Kingston upon Thames in Surrey) always has a big crowd by the new iMacs, so they must be proving popular.
My spec (I cancelled my original order for the 675MX) is:
3.4GHz Quad-Core Intel Core i7
8GB 1600MHz DDR3 SDRAM-2X4GB
3TB Fusion Drive
NVIDIAGeFrc GTX 680MX 2G GDDR5
I'll upgrade the RAM myself (honestly, how long before Apple start to use proprietary ram?) and this should last me for another 3.5 years or so.