In fact, the handset will come with a Micro USB cable out-of-the-box. However, there will be a USB Type-C adapter that will convert the Micro USB plug into a Type-C connector (see image above).
Specs-wise - from what is known till now - the Mi 4c will be powered by a Snapdragon 808 SoC with hexa-core CPU, and sport a 5-inch 1080p touchscreen. It will come with 2GB/16GB, 3GB/32GB, and 3GB/64GB memory options, and pack in a 3,120 mAh battery.
In terms of camera, the handset will feature a 13MP rear unit and a 5MP front shooter. It will ship running Android 5.1.1 Lollipop underneath Xiaomi's own MIUI 7 layer.