I would love to see in this iMac update, for the 27" at least:
Core i7 875K (or something somewhat/slightly faster than the i7 860)
Official support for DDR3-10666 (I mean, my current i7 iMac uses it just fine)
Matte display option (please?!??!)
User replaceable hard drive (harken back to the original iMac G5)
Option of no built-in speakers on the high end (allow for more cooling for GPU/CPU, more room for other stuff)
nVidia GeForce GTX 460/470 or ATI Radeon 5850 or 5870 (if the no speaker thing works) with >512MB VRAM (seriously, you're pushing a 3MP display, 512MB of VRAM barely does it, at least include 1GB of VRAM)
2.5" SSD slot somewhere in there
>=2 USB 3.0 slots and >=3 USB 2.0 slots (and space them out a bit better please)
>=1 Firewire 1600/3200 (don't be daft, and at least add a converter to 800 and/or 400)
Blu-Ray (lol, it'd be nice, but it won't happen)
mDP/HDMI in and out (even if it's just in, if Apple is too cheap/lazy to add a scaler that doesn't use the GPU, then 720p would be fine, as that pixel doubles nicely to the 27" res)
Ability to use Target Displayport In without requiring the computer to be on and booted into the OS
Target Displayport toggle to not require specific Apple keyboards
9K jumbo frames (ie. Apple, don't skimp out on the NIC controller this time, it's sad when my original MacBook Pro 15" unibody does network transfers almost 2-2.5x as fast)
Higher quality iSight camera (2.0-3.2MP sensor would be nice)
More frequent Boot Camp driver updates for GPUs (that's across the board) or just allow stock Catalyst/GeForce drivers from ATI/nVidia to work fine)
Remember when the original Power Mac G4s had DVD-RAM drives in there? They failed, and it got shuffled under the carpet.
Steve, even if Blu-Ray is a bag of hurt, choice would be nice. Given that there is no competing HD disc format anymore, I don't think there'd be a repeat of the DVD-RAM dismissal. A burner isn't necessary. Combo drive would be fine.
I assume that you can make Blu-Ray projects in FCP. I assume it would be nice to play that disc back without having to boot into Windows just to view it.
As for eSata, yes it's faster than FW800/USB2, but it can be a pain to hook up, since the eSata cable doesn't provide power. (Quite the oversight.)
If a good majority of this happens, my i7 iMac is so gone.