re: More good news about space exploration and science.
We'll soon learn if there are huge reservoirs of water-ice hundreds of meters
below the martian surface.
Er no, we won't. Radar can't tell the difference between ice and rock. Liquid water stands out hugely, so IF some is in the shallow subsurface (<2 km) it will be obvious. The radar probably doesn't have the power to penetrate 5 km (the design goal, which omitted some fundamentals about the iron-rich nature of Mars materials), let alone the 10-20 km required to get through the Permafrost.
OTOH, we'll get some very interesting radar profiles of Mars geology, and especially useful info in the polecaps where penetration should be very good due to low amounts of mineral dust.