The Samsung Galaxy S9 Plus USB type-C flex cable is now readily seen on the internet. The cable is used to connect the phone to a computer or to charge the phone via a Charger.
The use of wireless charger was used by iPhone X. But, it not yet clear if the Samsung Galaxy S9 plus will come with wireless charger.
Samsung Galaxy S9 Plus already known specifications are Android 8.0 Oreo, soc of Qualcomm snapdragon 845 with AI among others.