https://www.gamespot.com/articles/big-ps4-update-550-is-out-now-heres-what-it-does/1100-6457241/

The update seems extensive, but there's still no word on when we'll be able to change our PSN usernames--a feature much-requested by the PlayStation community. However, Sony hinted at PSX that this capability may arrive within the year. In other PS4 news, March's PS Plus games are now available, including Bloodborne and Ratchet & Clank on PS4.