I was under the impression Wayland on FreeBSD required a lot of patching on their end, but this has been merged upstream? If so that's pretty good news.
Also good news re colour management. The last I heard about this was Drew DeVault (and I'm paraphrasing) calling it "precious horseshit".
> Does upstream Wayland work on any platform except for Linux?
Yes, FreeBSD. Patches welcome to make it work on other BSDs.
> Does this display server have any form of colour management for, you know, the stuff it's displaying?
No more than X11 right now, ie. none. But it's in the works.