“Getting samples from this unique area will revolutionize how we think about Mars and its ability to harbor life.” - Thomas Zurbuchen, associate administrator for NASA’s Science Mission Directorate.
"The 2020 rover will help answer questions about the Martian environment that astronauts will face and test technologies they need before landing on, exploring and returning from the Red Planet." - William Gerstenmaier, NASA.
Sources:
NASA Press Release: NASA Announces Landing Site for Mars 2020 Rover
NASA Press Release: NASA Announces Mars 2020 Rover Payload to Explore the Red Planet as Never Before
NASA Press Release: Mars Helicopter to Fly on NASA’s Next Red Planet Rover Mission
Wikipedia Entry: Mars 2020
NASA Mars 2020 Rover: Entry, Descent, and Landing Technologies
Wikipedia Entry: Isidis Planitia
Research Paper: Major episodes of geologic history of Isidis Planitia on Mars
Wikipedia Entry: MSL Curiosity