There's a very long sticky thread on the Flying Blue (Air France + KLM) forum that goes into a lot of detail on Air France's arrival lounge in 2C. See:
http://www.flyertalk.com/forum/showt...arrival+lounge
We used it last week. Basic impression was that it was very small and claustophophic compared to AF's departure lounges at CDG. That said, the showers were state of the art and they had really nice amenity kits with L'Occitaine products, also decent breakfast snacks.