very sad too!
If have the target display mode for 5k imac, will buy.⚠
Please refer to Use your iMac as a display with Target Display Mode - Apple Support, it has not been modified to specially mention the 2017 imacs, however it does say:
"iMac (Retina 5K, 27-inch, Late 2014) and later iMac models can't be used as Target Display Mode displays."
very sad too!
If have the target display mode for 5k imac, will buy.⚠
Same for me. I would instantly buy an iMac 5k, if it supported target display mode! Without, I will stay with Windows...
2017 5k imac target display mode yet?