They are as follows:
Derrimut station; there is future development planned where the Werribee Agriculture and Food technology is.
Tarneit west station: serves growth corridor
West Werribee station; serves growth corridor
Blackforest station: serves growth corridor
North Eltham station: better access to rail in this area
Toolern station: serves growth corridor
Cambellfeild station; better access for rail in this area and also can connect with smartbus
Calder Park/Holden station; better access to rail in this area, serves growth corridor
Dandenong south station: better access to jobs in the Dandenong industry district
Cavehill station; better access to rail in this area
Note: Not adding Derrimut station on RRL yet so doesn't create confusion with Derrimut road station on Werribee line. If someone has a better name for either of the stations let me know.
It was fun to come up with a list, maybe someone can add to the list or come up with their own version. Any questions ask below: