This is awesome-sauce from Zettt:
>With the advent of iCloud, there is now a new shortcut to save files in that location, for apps that support iCloud: Command-Shift-I.

I tested this in Writer and it works like a charm — Command-Shift-D (to move the desktop) is probably the most used shortcut across various apps that I use, something tells me that by this time next year that shortcut will be Command-Shift-I.

I am going head first into iCloud for document storage — I hope every app that can, adds support for it.