The architecture was pretty far along, completely extensible with new verbs and parsers in JS. They'd got rid of the ugly hyphens from that demo video with a better parser. https://wiki.mozilla.org/Labs/Ubiquity/0.2_Design:_UI_and_Se... They'd even solved most of the localization problems, like verb-subject-object or subject-verb-object, and pronouns, and stuff. I really would like to see this revisited sometime.
https://mozillalabs.com/ubiquity/2010/03/10/community-mainta...
I still use and love this tool every day.