Viggo isn’t the only big name. Neil DeGrasse Tyson will host; Patrick Stewart is also on board as astronomer William Herschel, and Academy Award winning costume designer Ruth E. Carter will bring her magic. See the IndieWire article for more details.
This Cosmos sequel series will premiere March 9, 2020 on National Geographic, with a summer premiere on Fox. The new trailer for the series doesn’t mention specifics but is still a good watch: