This general idea is brilliant. Think what it does for discoverability of application functionality. I'm sure Chrome (where I'm typing this) has a multitude of

This general idea is brilliant. Think what it does for discoverability of application functionality. I'm sure Chrome (where I'm typing this) has a multitude of useful shortcuts that I'm not aware of but that my keyboard could be teaching me. Suppose I push Control and every key changes to show what would happen were I to combine it with the Control modifier. Same for games---could save me a few hundred peeks at the Dungeon Crawl Stone Soup help menu. As I've said in another comment recently, there seems to be a lot of innovation around keyboards right now---Apple's Touch Bar, RGB keyboards, this e-ink thing. I'm excited for the possibility of new standards emerging and new ways of interacting with existing applications being developed.