My understanding from the Release Notes is, that the new Salesforce Mobile App Experience is shown up automatically for every user. Unfortunately it does not nor did I find any way to enable it. The Salesforce App (iPad) is the latest from the App Store. When I authenticate against a Scratch Org it does display the new experience. But when I authenticate against a partial sandbox or production org it always shows the old one. We tested on two different devices so the issue must be tight to the org.
Any ideas how I can enable the new Salesforce App or what prevents the new App from showing up?