I think the end game is you open excel and say "Work out what our budget is for the FooSnaggit event based on what Tim said in his email yesterday, and what we spent last year." (for example) and it will go off and read your email and read your other sheets and generate the right thing based on that prompt and that context from your other documents.
I think that will be incredibly powerful ... if it can be trusted. Trouble is now I can't trust these things to get these sort of things correct, so you end up having to double check everything and make corrections etc so you are not really saving that much time.or effort.