This is not a specific feature request, but more a general idea about Adobe doing a spreadsheet application.
Think about using functionality in Illustrator and InDesignTo be able to draw new sheets in threaded “Spreadsheet boxes” and “Cell boxes”, using layers for calculations/functions/data as well as text/graphic assets, writing functions and formulas in native language, using any graphics assets for conditional formatting and diagrams, place files in InDesign with full compatibility, advanced text formatting in Text Boxes nested with “Spreadsheet boxes”, tear-away panels.
Just some initial thoughts....