"The Mars 2020 mission will be based on the design of the highly successful Mars Science Laboratory rover, Curiosity, which landed almost two years ago, and currently is operating on Mars. The new rover will carry more sophisticated, upgraded hardware and new instruments to conduct geological assessments of the rover's landing site, determine the potential habitability of the environment, and directly search for signs of ancient Martian life."
Keith's note: (sigh) NASA still does not have the imagination or inclination to search for signs of extant life on Mars. All they seem to be willing to do is see if it used to be there. At the rate that they are going it will be 20 years before they get up the nerve to try and answer the question.
Keith's update: I asked the following question at the Mars 2020 Rover press event today. "Your press release says "determine the potential habitability of the environment, and directly search for signs of ancient Martian life." Why isn't NASA directly searching for signs of EXISTING LIFE on Mars? And I will ask my follow-up since the answer to this question is always "we don't know how to look for life on Mars - yet". - How are you going about the task of learing how to look for existing life on Mars, when will you have this capability and why is it that NASA was eager to search for existing life on Mars 40 years ago but is unwilling or unable to do so now?"
I obviously expected Jim Green to answer in the same cautious way that NASA has always answered this question - one I have asked again and again for the nearly 20 years. Instead, Green launched into a detailed description of all the things that the Mars 2020 rover could detect that have a connection with life. Much of what he said clearly referred to extant / existing life. Now THAT is cool. To clarify things I sent the following request to NASA PAO "Can the Mars 2020 rover detect extant/existing life on Mars? Will NASA be looking for extant/existing life on Mars?" Let's see how they respond.