Index: wp-includes/ms-functions.php
===================================================================
--- wp-includes/ms-functions.php	(revision 18407)
+++ wp-includes/ms-functions.php	(working copy)
@@ -706,7 +706,7 @@
 			$errors->add('blogname', __('That site is currently reserved but may be available in a couple days.'));
 	}
 
-	$result = array('domain' => $mydomain, 'path' => $path, 'blogname' => $blogname, 'blog_title' => $blog_title, 'errors' => $errors);
+	$result = array('domain' => $mydomain, 'path' => $path, 'blogname' => $blogname, 'blog_title' => $blog_title, 'errors' => $errors,  'user' => $user);
 	return apply_filters('wpmu_validate_blog_signup', $result);
 }