Update: Hours after this story was published, Apple updated the tech specs for the new iMac to indicate that configurations with the 10-core M4 chip support one external display with up to 8K ...
Until recently, Macs didn’t work with 8K displays/TVs. That’s because Macs had HDMI 2.0 ports that only supports one display with up to 4K resolution at 60Hz and capped Thunderbolt display connections ...