The new stations were installed alongside the update that introduced them. You should see them in the StarMade -> blueprints-stations folder. Any station that has not been generated/loaded yet should be one of the new ones while stations that have already been generated/loaded will still be what they loaded as. You may have to move around a bit to get to where there are fresh stations loading. Any which show up on your galaxy map (press 'P') as undiscovered stations should be new ones.