You don't always need a sky crane to get to the surface Mars. Sometimes you need to just spread your wings and glide. The MARSDROP program would involve sending two probes to the surface of Mars by sailing them down from above. Because of this technique, and because of their small size, they can go to rougher terrain where other probes can't.
The MARSDROP concept was developed by Rebecca Williams of the Planetary Science Institute. Researchers at JPL have already tested the bots, getting them to autonomously land within 10 meters of their intended targets here on Earth. The probes are just one feet across and weigh around two pounds.
After an initial drop at 15,000 miles per hour, a sort of mothership would deploy a parachute to slow down and then separately release the probe. From there, the probe would parasail to speeds of about 16 mph as it makes a relatively soft landing on the Martian surface.
The MARSDROP is still in the prototype stages at NASA's Jet Propulsion Laboratory, so there's no launch date – and still plenty of time to give it a cooler name. They could also be deployed to other places in the solar system with atmospheres, including Titan. So, no word yet on if they'll be ready in time for the Mars 2020 rover. Maybe 2024?