You're spot on, Orion will be considered Prefect 2.0 in the future - for now it's released as a technical preview so that we can gather user feedback as we develop it.
Since Orion is in a technical preview, we don't recommend using it in a production setting just yet. So if you need to run some workflows in production, we recommend starting with Prefect 1.0 and Prefect Cloud. But if you are currently running flows only locally. you can use Orion right away.