The seventh beta of macOS Monterey contains what appear to be references to new screen resolutions suitable for the MacBook Pro line, as discovered by MacRumors.
In a list of supported graphics resolutions within macOS, there are two new resolutions: 3,456 by 2,234 and 3,024 by 1,964. Each carries a “Retina” marker, which Apple typically only applies to its own devices’ screens.