Some key points:
The new control is only available in Access 365, NOT in any existing perpetual version. The old web browser control remains in parallel in 365.
The control will be enabled in: Monthly Enterprise Channel in version 2307, released on Sept 12, 2023 Semi-Annual Channel (Preview) Version 2308, also released on Sept 12, 2023 Semi-Annual Channel when it moves to Version 2308, on Jan 9, 2024
If the new control is contained in a database that is opened with other Access versions than 365, the new control will simply not be visible, i.e. the same behaviour concering backwards compatibility as with Modern Charts.
Unlike the old control, the new one also works in continuous forms and reports and can be printed out.
Due to security restrictions, a prefix must be used to display local files: https://msaccess/YourFullPathHere and for redirects the trusted domains must be entered in a table.
Let us know in comments here if you notice any problems or bugs. We can pass this on to the Access team.