Here's the news from TVLine: "Superman and Lois Ending With Season 4"
I can't I've liked everything about Superman & Lois (like the ampersand in the title, and can't somebody buy Tyler Hoechlin a razor?), I enjoyed the show when it was good and played to its strengths -- the Clark/Lois romance -- and less so when it went into too many rabbit holes with their whiny sons.
This is the last of the Arrowverse shows to remain on the air, which is a great accomplishment we fanboys could not possibly have dreamed of when we were kids: An entire network devoting its air to multiple live-action shows featuring DC superheroes! This went far beyond those cheesy Filmation cartoons with Superman, Batman, Aquaman, Green Lantern, the Atom and Hawkman when we were small!
Some might quibble that the Arrowverse ended with the series finale of The Flash. That's because for some odd reason, Superman & Lois was retconned out of the Arrowverse with a line of dialogue from Lois Lane's father, General Sam Lane. Lane made a comment to the effect that Superman is this universe's only hero, thus ending any possibilty of this version of Superman meeting Supergirl, the Flash, Green Arrow, the Martian Manhunter, Black Lightning, Batwoman, Black Canary, John Constantine, the Legends of Tomorrow or the other heroes who popped up in the "Crisis on Infinite Earths" crossover.
And that's another thing we have to thank the Arrowverse for: that it built up enough of a continuity that it could even pull off a "Crisis on Infinite Earths" crossover!
So here's a note of farewell to Superman & Lois. Let's enjoy these last 10 episodes and remember how great it was to have DC superheroes on TV every week.