make use v2...

lib/backbone.cartodb.js

@@ -38,7 +38,7 @@ Backbone.CartoDB = function(options, query, cache) {
     };
 
 
-    var resource_path= options.user + '.cartodb.com/api/v1/sql';
+    var resource_path= options.user + '.cartodb.com/api/v2/sql';
     var resource_url = 'https://' + resource_path;
 
     /**

lib/cartodb-gmapsv3.js

@@ -65,7 +65,7 @@ var CartoDB = CartoDB || {};
         // If the table is private you can't auto zoom without being authenticated
         if (!params.map_key) {
           $.ajax({
-            url:'http://'+params.user_name+'.cartodb.com/api/v1/sql/?q='+escape('select ST_Extent(the_geom) from '+ params.table_name),
+            url:'http://'+params.user_name+'.cartodb.com/api/v2/sql/?q='+escape('select ST_Extent(the_geom) from '+ params.table_name),
             dataType: 'jsonp',
             timeout: 2000,
             callbackParameter: 'callback',
@@ -429,7 +429,7 @@ var CartoDB = CartoDB || {};
 
 
     $.ajax({
-      url:'http://'+ this.params_.user_name +'.cartodb.com/api/v1/sql/?q='+infowindow_sql,
+      url:'http://'+ this.params_.user_name +'.cartodb.com/api/v2/sql/?q='+infowindow_sql,
       dataType: 'jsonp',
       timeout: 2000,
       callbackParameter: 'callback',