Sorry to pollute your 777 thread with airbus stuff.
The vertical profile on the airbus after you've extended the centreline is dynamic. i.e. it assumes that you join the extented c/l in the shortest way possible which is a direct to the TO-wpt (FAP) in most cases e.g. when on downwind. The same would be the case for clearing the PPOS and having the flightplan sequenced with the FAP as the TO-wpt as described by A330pilotcanada (pre FM2 technique). That's why we consider it as a piece of non-information.
I would imagine something similar for the 777. Sorry I can't be of more help. No info in the FCOM or Bulfers' big boeing FMC guide?