from theme-settings.php:

function genesis_theme_settings_info_box() { ?>
	<p><strong><?php _e('Version:', 'genesis'); ?></strong> <?php genesis_option('theme_version'); ?> <?php echo g_ent('&middot;'); ?> <strong><?php _e('Released:', 'genesis'); ?></strong> <?php echo PARENT_THEME_RELEASE_DATE; ?></p>


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from theme-settings.php:

	'theme_version' => PARENT_THEME_VERSION


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from init.php:

define('PARENT_THEME_VERSION', '1.5');