Ethereum Metropolis

Metropolis is the release that opens the gates to the masses. This is where there are fully fledged and tested user interfaces for the non technical users. Although this is now being performed by individuals - for example the ethereum desktop wallet. Again it is unclear when this phase will take place and whether it depends on the pace of external community development.

[1] https://www.cryptocompare.com/coins/guides/the-ethereum-releases-of-frontier-homestead-metropolis-and-serenity/