I’d echo the same things I mentioned in the homepage thread (cross-platform development (web/mobile/desktop), vertical slicing architecture (this is extremely appealing to me), and being as intuitive and easy to use as possible) 
Another thing I’d add maybe is when it comes to the docs and tutorials, assume people only know the basics (Elixir/html/css) as that will not only make it easy to on-board newbies, but will make it easier for everyone else too - because if something doesn’t quite make sense we could step down a level in the docs or tut and work our way back up from there.
