We’ll definitely do our best to update the thread when we’ve got something to report re the fix 🙂 (failing that, our blog and our changelogs will also reflect the change).
Is there a way to add a class for expired dates so we can hide them with CSS?
Well, you could just not output them at all. Above:
$dates[ tribe_get_start_date( $possible_id, false, 'U' ) ] = tribe_get_start_date( $possible_id );
You could add:
if ( tribe_get_start_date( $possible_id, false, 'U' ) < date_i18n( 'U' ) )
continue;