Tvc-mall.com (via CydiaBlog) has some “iPhone 5″ cases for sale (at just $1.58 each!) that seem to align with the many, many, many, many next generation iPhone body part leaks. One thing to remember: Just because a case maker is producing cases, does not mean the next generation iPhone will fit into it.
As you can see, the cases are longer to accommodate the larger 4-inch display and have a smaller dock connector hole at the bottom. The speaker holes are bigger with the addition of the headphone jack rumored to be moving down south.