Really cool promo video. I'm not sure what is particularly unique compared to what we now have in tools like Coda and such. Maybe more spreadsheet-focused than the others?
You start with a grid. Grid is flexible and you get cells with literals or cells with formulas.
The new stuff is Integrations, to import and automate data from Saas tools (your API, BigQuery, Ads platforms, Google Analytics, Slack etc).
And Sharing, as every spreadsheet is shareable as a webpage and every table/ chart is embeddable.