Index: wp-admin/includes/class-wp-posts-list-table.php
===================================================================
--- wp-admin/includes/class-wp-posts-list-table.php	(revision 22625)
+++ wp-admin/includes/class-wp-posts-list-table.php	(working copy)
@@ -556,7 +556,7 @@
 				if ( $post_type_object->public ) {
 					if ( in_array( $post->post_status, array( 'pending', 'draft', 'future' ) ) ) {
 						if ( $can_edit_post )
-							$actions['view'] = '<a href="' . esc_url( add_query_arg( 'preview', 'true', get_permalink( $post->ID ) ) ) . '" title="' . esc_attr( sprintf( __( 'Preview &#8220;%s&#8221;' ), $title ) ) . '" rel="permalink">' . __( 'Preview' ) . '</a>';
+							$actions['view'] = '<a href="' . esc_url( apply_filters( 'preview_post_link', add_query_arg( 'preview', 'true', get_permalink( $post->ID ) ) ) ) . '" title="' . esc_attr( sprintf( __( 'Preview &#8220;%s&#8221;' ), $title ) ) . '" rel="permalink">' . __( 'Preview' ) . '</a>';
 					} elseif ( 'trash' != $post->post_status ) {
 						$actions['view'] = '<a href="' . get_permalink( $post->ID ) . '" title="' . esc_attr( sprintf( __( 'View &#8220;%s&#8221;' ), $title ) ) . '" rel="permalink">' . __( 'View' ) . '</a>';
 					}
Index: wp-admin/includes/post.php
===================================================================
--- wp-admin/includes/post.php	(revision 22625)
+++ wp-admin/includes/post.php	(working copy)
@@ -1327,7 +1327,7 @@
 		$url = add_query_arg( array( 'preview' => 'true', 'preview_id' => $id, 'preview_nonce' => $nonce ), get_permalink($id) );
 	}
 
-	return $url;
+	return apply_filters( 'preview_post_link', $url );
 }
 
 /**