The showrunners revealed the first two minutes of The Good Place's third season during a panel at Comic-Con. The scene begins with Michael walking down a bridge and meeting up with "The Guard," who's played by Mike O'Malley. The former Bad Place architect, armed with paperwork, explains, "I have the ruling from the judge to head down to Earth and reverse the deaths of these four people." He then says that this may "cause ripple effects in the timeline," but it's his only way to discover if bad people can become good after dying. The Guard gives his stamp of approval and warns Michael that he won't have any of his powers on Earth. Michael then pushes Eleanor away from her fatal shopping cart fate and returns to The Guard's station.
We should expect to see how Chidi, Jason, and Tahani, in addition to Eleanor, hold up with their do-overs on Earth. There's a good chance that all four humans will reconvene once more.