HP needs 6-8 weeks to ship additional TouchPads, according to a leaked email sent to customers. HP is prepping one last run for its defunct tablet. Hewlett-Packard will apparently need close to two months to start fulfilling backorders. HP needs 6-8 weeks to ship additional TouchPads, according to a leaked email sent to customers. HP is prepping one last run for its defunct tablet. Hewlett-Packard will apparently need close to…