Hello guys,
I am thinking about same thing - buying the late 2015 5k iMac. I was waiting till the last event but I was disappointed because no update for iMac also higher prices for MBP and also only USB-C ports so it seems that MBP is not an option for me now and for almost same price I can get stunning 5k display. I don't need a portable device - I have Dell from my employer. I am considering the middle version of iMac (3,2GHz i5, 1TB Fusion Drive, M390), but I still don't know if it is worth to buy one year old HW. I mean I know it has enough power hopefully for next couple of years. I would like to have that machine at least for 6 years. Currently still using first unibody MBP (late 2008, 15" screen, 8GB, 256 GB SSD) and it is already little bit slow but usable. Anyway I think it is time for upgrade.
What I use the machine for:
- RAW files processing (Lightroom)
- processing of HD and 2K movies (iMovie)
- occasionally web development
- office work & internet
So still don't know if I should buy one year old HW or wait to March if there will the iMac refresh but I am a little bit scared what they can do with it (price increase, only USB-C ports, ???? )
Tough call for me

How do you see it?