iLounge has received more photos supposedly showing cases for upcoming iPod models. As with the case photos discovered last week, these cases are from X-Doria, and offer a glimpse into the shape and features of the fourth-generation iPod touch and a smaller, squarish iPod that could be either the fourth-generation iPod shuffle or sixth-generation iPod nano—notably, it was referred to as the former in our e-mail exchange with the company. These…