I wish I could use it as an external display. I would buy one as my personal machine and then use the display during the day with my MBP for work. Would be nice in this new world of remote work.
Though maybe I should be thanking them; I'd almost certainly have bought one if target display mode was available, so they've saved me money!
With Apple Silicon I suspect we will see the return of target display mode. I can't wait!
There's also some screen extender software, but you absolutely want a wired connection or it'll be painful.
Because Target Display Mode is no longer supported:
"Make sure that your iMac is using macOS High Sierra 10.13.6 or earlier. You can't use target display mode with later versions of macOS, or with Boot Camp and Windows."
Having mentioned that, it'd be awesome if we could plug it into a MacBook Pro via USB-C and use it as a power supply, an eGPU, and an external monitor. And maybe also mount the disks.
That would be great.