As long there is a 911 this model is the figurehead of the brand Porsche. So with the new one (with factory code 991) just presented you can bet that the other models soon will follow with the same front of the latest 911. So also the Panamera.
The innovations seem mainly to relate to the front. Presumably, there will be more rounded headlights and get the LED-daytime running a slightly different form. The front bumper also gets an update, although this prototype still contains the existing bumper. We expect the new Porsche Panamera at the summer of next year.