Unofficial reply to @Roboter Hersteller's question:
What Cortex materials will be backward compatible for the V5 system? Will you be able to use the sensors and 393 motors or will will all electronics need to be upgraded?
If I remember correctly, V5 has 8 legacy ports compatible with 393s and the old sensors. However, it operates at a lower voltage and therefore 393s will not be as powerful. 393s on a V5 are also not competition legal.