With todays flash, you get one temperature of light from the flash, and another from the ambient light. Your foreground and background will then have different light temperatures on them making color correction difficult, even from the RAW photo.
So... a flash that could mimic the color of the ambient light, would mean foreground and background could then both be corrected with the same fix, or the camera could do it automatically.
Sounds very high-tech, and like the kind of thing I would never use.