According to SimOnlyRadar, iPhone 5C will still have built in Siri functionalities. As for its hardware, it will be using a dual core processor with 1GB of RAM and 16/32/64GB of built in internal storage. It has a 4.0 inch screen at 1136 x 640 resolution . On the camera side, iPhone 5C will have a 8 Megapixel rear camera and a 1.2 megapixel front camera. It will have a body size of 124.2 mm x 58.4 mm x 7.6 mm and weighs 106grams. Of course, iOS7 will be preloaded in the new smartphone.
On the other hand, for comparison purposes, iPhone 5 has a 123.8mm x 58.6mm x 7.6mm dimensions. iPhone 5C will be a little longer, but also at the same time narrower. These changes are imperceptible as they are insignificant. The thickness remains unchanged. iPhone 5 weighs 112 grams. This means that iPhone 5C will be a few grams lighter.
16GB version of iPhone 5C is said to retail at about 400USD and will be available by the end of September.