Hi @marka590, welcome to the Sonos Community!
There isn’t a firm ETA on when playlist creation and editing will return in the Sonos app. For now, it’s recommended to use the Sonos Desktop Controller to manage playlists.
Regarding using Sonos Voice to control your music library: there’s nothing in the works for this that I can see and I assume this would be treated as a feature request. I’d be happy to forward this along to the relevant team for their consideration.