According to IATA, France plans to simplify (no kidding) security checks for transfer pax.

In theory, when arriving from another country that is considered "clean", i.e. all Schengen countries and most if not all other EU countries, pax would no longer have to re-clear security when changing planes in France.

This will be introduced in Lyon (where it sort of already exists today), and at "some terminal" at CDG. I assume within 2D and 2F, and for transfers from between and from these to each other and to 2E and 2C. I do not think it will be introduced in Terminal 1.

Source: a newspaper article which quotes IATA