The new designs are the 700 to replace current 72-500/600 and the 900. They are new designs with the same general configuration, but loading underfloor and the use of all available tech gains from A380/350 projects.
Will be interesting to watch. The 600 is an increase in takeoff/MCT power only and 200kg heavier. Not ideal as the 22.8t 500 is not a climb performer at all.
Time will tell it always does.
Cheers