Just read James Robertson’s Post “Web Workplace: A new word for Intranet”.
I agree that Workplace describes a more holistic view of for what typically fulls under the “Intranet” umbrella. A few years ago now, IBM adopted the term to describe a new organization formed when the Corporate Intranet team moved out of Communications and under the CIO. The mission of the “Total Workplace Experience” group extended to everything “on the glass” - which I think was (and still is) the right way to think about things.