I'm booked on the LHR-ZRH-EZE thingy on 24 Dec and the flight is already fully booked in Economy. I assume they will be bumping some y-c (and maybe as a result some C-F). I would gladly offer some of my points for a guaranteed C-F upgrade but as I'm the lowest tier I can't do this.
It's a shame becuase they'll probably end up upgrading some others for no points.
Stephen