Ubercart - how to get order information from order ID?
Using the Ubercart API at api.ubercart.me, it is 

$orders = uc_order_load($orderId);


$orders is an array, so $order = $orders[0];

See:
http://api.ubercart.me/api/drupal/ubercart!uc_order!uc_order.module/function/uc_order_load/7