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No new hooks added in 5.2.1 Below are recently added.

jetpack_sync_site_url

hook (filter): Allows overriding of the site_url value that is synced back to WordPress.com.

Source: sync/class.jetpack-sync-functions.php:193

jetpack_sync_home_url

hook (filter): Allows overriding of the home_url value that is synced back to WordPress.com.

Source: sync/class.jetpack-sync-functions.php:180

jetpack_sync_updated_nav_menu_update_item

hook (action): Helps sync log that an update to the menu item happened.

Source: sync/class.jetpack-sync-module-menus.php:69

jetpack_sync_updated_nav_menu_add_item

hook (action): Helps sync log that a new menu item was added.

Source: sync/class.jetpack-sync-module-menus.php:51

jetpack_sync_updated_nav_menu

hook (action): Helps sync log that a nav menu was updated.

Source: sync/class.jetpack-sync-module-menus.php:35

jetpack_deleted_theme

hook (action): Signals to the sync listener that a theme was deleted and a sync action reflecting the deletion and theme slug should be sent

Source: sync/class.jetpack-sync-module-themes.php:169

jetpack_edited_theme

hook (action): Trigger action to alert $callable sync listener that a theme was edited

Source: sync/class.jetpack-sync-module-themes.php:140

jetpack_network_enabled_themes

hook (action): Trigger action to alert $callable sync listener that network themes were enabled

Source: sync/class.jetpack-sync-module-themes.php:90

jetpack_network_disabled_themes

hook (action): Trigger action to alert $callable sync listener that network themes were disabled

Source: sync/class.jetpack-sync-module-themes.php:76

jetpack_widget_edited

hook (action): Trigger action to alert $callable sync listener that a widget was edited

Source: sync/class.jetpack-sync-module-themes.php:50