I remember that there was the potential of a Mac-OS/2 merger through Taligent and as someone who had a Mac on one desk and an OS/2 machine on the other I was really hoping this would happen.
I don't know if this is the same thing, but you may be interested in this failed project from IBM in the 1990s that attempted to leverage Taligent and OS/2 to create a universal operating system that used a microkernel and was capable of presenting different UI and programmatic "personalities."
Yeah, I think that was it. Most of what I remember from that era was the pile of printed OS/2 programming manuals on my desk.