I agree with those that argue that Air France should not be relied upon when it comes to deploying the new cabins exactly as announced in their statement. When they say "From date, flight AF xxx, CDG-yyy" one may still end up on a plane with the old cabin (yikes).

However, I use expertflyer's seat map and I find that very reliable. Air France has to decide many weeks ahead which plane will do a certain flight on a certain date, and they can do so by planning planes' rotations, their ground times for maintenance, etc. Otherwise it would be impossible to offer seat maps at the time of booking.

This does not protect passengers from a last minute change which may occur because the BEST plane that was supposed to operate the flight has gone tech. But expertflyer in general is a very reliable indicator at least of what Air France intends to do.