If this is any indication of what the iMac will look like, I'm in heaven!
http://www.engadget.com/photos/is-this-the-new-imac-keyboard/328166/
For all of you requesting a 2nd hard drive, why not eSATA? This would leave it up to those who NEED a second HDD. Remember that Time Machine will also work with DVDs? Pretty sure I remember hearing that somewhere. Which will especially make sense when BluRay comes to the mac.
Here's my wish list:
-Slim aluminum enclosure that looks nothing like the current line (look at the iMac history - it's full of dramatic changes)
-User expandability (easy access to RAM and HDD(s)
-Articulating arm and or VESA compatibility
-1 or 2 PCIe slots (yeah right) or Express slot like MBP (Apogee Symphony!)
-FW 400(2) & 800
-4-8 USB 2.0
-eSATA 3Gb/s of course
-Gigabit Ethernet
-Wireless + Bluetooth
-External Power Supply (think about it, less heat from the machine, quieter operation, easy replacement)
-20", 24", & 30"
-backlit keyboard
-stereo line-in/out jacks with (surround capable) optical (perhaps surround will be an update to Core Audio in Leopard?)
Either way, I'm waiting until Oct. to buy for a free copy of Leopard.
My $0.02