They've known there was lots of water for awhile but not proven about running water until recently. Also probably has melts with some running water from ground melts on occasion even now.
This means there is no need to worry about carrying (mostly that's not feasible) water to Mars or manufacturing it there either. It also solves the problem of O2 there as they can make both hydrogen and oxygen from the water. The H gives energy back and the O2 to breathe. They just need energy to start it all and they should be able to use a combination of mostly solar, maybe nuclear, and possibly wind power for their energy along with the hydrogen which can provide energy for heat when solar not good and fuel for their rovers.
Did you know there are only 5000 Snow Leopards in the wild now and they are confined to Central Asia? However, the effective global population (those likely to reproduce) is less than half that number.