Yes, micro USB is only used for DC-IN (weird decision in my humble opinion since the Remix folks use a 3A PSU for their Remix Mini and speak about 10W consumption) and regarding the USB OTG port according to the aforementioned thread:
We will see what that means.
Quote:The micro USB port type B is 5 pin which has ID pin to determine OTG or Host. However, the Pine64 lower USB port is type A and 4 pin which means lacking ID signal. Currently the schematic lets the ID pin float with a pull high resister. In current Pine64 Android OS, we manually set the lower USB port to host mode instead of determine by ID pin.
We will see what that means.