"The Witcher 3 is at least 3.7 times bigger than GTA: San Andreas (36 km2), 1.5 times bigger than GTA 5 (81 km2), 3.3 times bigger than Red Dead Redemption (41), 3 times bigger than Far Cry 4 (46 km2) and 3.5 times bigger than Skyrim (39 km2)."
( I know, not actually a news, but for people who don't got it or forgot about the live-stream, plus gonna edit afterwards into a link when the session is gonna be provided as a record on twitch )