I've done testing with the Base-Canada, Base-USA and Base-World templates and only found two scripts that needed minor updates to run on PHP 8.+ (and still compatible with older PHP versions).
common.php V1.11 and flyout-menu.php V1.09 are now available using the
update tool with a query of Base-*, Plugin-* 07-Dec-2020
The remaining support scripts seem to work fine and not cast errata in the error_log. It's safe to update before you update PHP to 8.0.0 as the fixes were backward compatible to prior PHP5/PHP7.
