A few hours ago the Ionic Team released the next beta for the v3 CLI:
Here is a overview of the changes in commands:
https://docs.google.com/document/d/1r8nTAaJ5hLIJ1DCwBozU-JGV480Du0xCMIg2dj3JRQo/edit
Here is the normal README with additional installation instructions:
https://github.com/driftyco/ionic-cli/tree/v3#ionic-cli
And here is a changelog that also explains a bit why stuff was changed:
https://github.com/driftyco/ionic-cli/blob/v3/CHANGELOG.md
Looks pretty solid to me.