"One rover bound for Mars in 2020 is already under construction by Airbus in Stevenage and the knowledge and expertise honed there will now be applied to designing this new mission, which aims to safely deliver - for the first time - material to Earth from another planet". The vehicle will be called the Fetch Rover and it might be ready for launch by 2026. According to the United Kingdom government, this new rover will pick up sample collected by NASA's Mars 2020 rover and then transfer them back to an ascent vehicle.
The Mars 2020 rover's task is to dig and contain the soil sample into 30 tubes and dropping them at various point around the planet.
A mission to return samples from Mars isn't of much use if they don't actually return, which is why ESA is working on a new robotic rover to retrieve containers of Martian rock and soil left behind by NASA's Mars 2020 rover. Fetch will also have to plot its route by itself.
Ben Boyes, who will lead the feasibility team at Airbus, explained that Fetch will be a relatively small rover - about 130 kg - but what is required of it is very demanding. Then, yet another spacecraft will rendezvous with the ascent vehicle in Mars orbit (again, this has never been done before), transfer the samples (never been done), and then that second spacecraft will depart Mars orbit and come back to Earth (you guessed it, that's obviously never been done either).
Simultaneously, ESA's ExoMars rover will be drilling below the Martian surface to search for evidence of life, and the ExoMars orbiter now sampling Mars' atmosphere will form a crucial part of the communications infrastructure for the Sample Return mission, for which it will act as a relay satellite.
It is estimated that it could take up to 150 days for the fetch rover to retrieve all the canisters that the 2020 rover leaves behind, before it locates the rocket it landed with, and films the Earth Return Orbiter's takeoff.
The story is based on a report by the BBC.