BTW: MorphOS is kind-of in the total opposite situation; hardware is out there and available, but the next major update to it (1.5) has been "due for release any time soon" for quite a while now, and a fair few MOS users have totally given up hope for it to ever appear.
Personally, I'm a MorphOS developer, and I can see for myself that MorphOS development hasn't stalled (there are new updates nearly every day for internal alphatesters).
Just don't ask when 1.5 will be out. ;-)