I haven't been following this space in a while. Can you shed some light on why the sizes are changing from 14px to 16px? On the kickstarter page it says it says the new size matches Bootstrap 4's global font size; is that the sole reason? (Edit: this was partially answered since but I'm curious)

I wonder, is traditional incremental versioning appropriate for what users perceive as a 100% stylistic change (notwithstanding the immense effort of a full rewrite of its internals). Do you intend to enhance Font Awesome 4 after the release of 5, or is 4 going to be EOL?