I have an 27-inch iMac, mid 2010. It has an Core i3 CPU, 12 GB DDR (1333 Mhz), ATI Radeon HD 5670 512 MB and Intel 120 GB SSD which I had built in myself. This was my first Mac ever and I loved it for the past 5 years. I bought the low spec iMac since I really wanted that beautiful 2560 x 1440 screen and didn't really care for the specs. I was just reading websites, watching Youtube, downloading stuff etc.
This iMac actually unleashed my creativity, I love doing some video (1080p) editing with FCPX (and before with iMovie) and photo editing with Lightroom. It is still in pristine condition and run things well but lately it has started to show his age. I cannot play 1080p60 Youtube videos and obviously 4k as well. 1080p and 720p60 plays just fine. And don't get me started on FCPX and Lightroom. It gets the job done...if you do have patience.
So, I am really looking forward to this new Skylake CPU's. I would be disappointed if the 27-inch iMac went with Broadwell.
The biggest reason I want to upgrade is actually the Retina 5k display but this time around I want to max out my iMac purchase.
This is what I want;
27-inch iMac retina 5k display
GPU with 4GB RAM
Skylake Core i7 CPU
32 GB RAM
PCIe Flash (4 lanes, please) 1 TB SSD
If above cannot met, I won't buy a new machine yet. I just want Skylake to be in there and support for 4 lanes PCIe SSD. Too bad that I won't make the jump to 5k.
I also do hope with the next iMac refresh they bring some nice extra's such as new Magic Mouse (with Force Touch?) and Keyboard as well.
Make it happen, Apple!