_redirect_to_about_wordpress( string $new_version )

function _redirect_to_about_wordpress( $new_version ) {
	global $wp_version, $pagenow, $action;

	if ( version_compare( $wp_version, '3.4-RC1', '>=' ) )
		return;

	// Ensure we only run this on the update-core.php page. The Core_Upgrader may be used in other contexts.
	if ( 'update-core.php' != $pagenow )
		return;

 	if ( 'do-core-upgrade' != $action && 'do-core-reinstall' != $action )
 		return;

	// Load the updated default text localization domain for new strings.
	load_default_textdomain();

	// See do_core_upgrade()
	show_message( __('ClassicPress updated successfully') );

	// self_admin_url() won't exist when upgrading from <= 3.0, so relative URLs are intentional.
	show_message( '<span class="hide-if-no-js">' . sprintf( __( 'Welcome to ClassicPress %1$s. You will be redirected to the About ClassicPress screen. If not, click <a href="%2$s">here</a>.' ), $new_version, 'about.php?updated' ) . '</span>' );
	show_message( '<span class="hide-if-js">' . sprintf( __( 'Welcome to ClassicPress %1$s. <a href="%2$s">Learn more</a>.' ), $new_version, 'about.php?updated' ) . '</span>' );
	echo '</div>';
	?>
<script type="text/javascript">
window.location = 'about.php?updated';
</script>
	<?php

	// Include admin-footer.php and exit.
	include(ABSPATH . 'wp-admin/admin-footer.php');
	exit();
}