- key rotation
- login with legacy networks
- personal storage
- instant messenger with perfect forward privacy
- built in wallets w/ advanced features
- streaming payments
- AI run locally and remotely for sats inc. virt. assistants
- full client customization
- single sign-on to micro apps, and existing web apps
- widgets and micro apps within notes
- music, video, entertainment as first class within notes
- games
- productivity and integration tools, calendar, alerts
- full nostr operating system, inc. runnable on a phone
First gen clients can optionally pick the features they want to add, but none should be mandatory. Maybe not every feature can be achieved, but I think most can.