With all the delays the corona virus is causing, the CW is pushing the premiere of the mid season shows like Legends of tomorrow to a later date than January 2021 (source) with the synopsis being as follow, please be aware it contains spoilers from the finale of the current season that didn’t air yet:
I have to say, it feels good to be able to post an update again! I’ve updated the gallery with HQ screencaptures of Matt’s first appearance as a series regular on DC’s Legends of Tomorrow. The caps you’re looking for are on the last page, enjoy!
For a character who had his own show canceled after just one season, years later Matt Ryan’s take on DC’s snarky English spellweaver John Constantine is still surprisingly flourishing. Along with guest-starring on Arrow and a full-time turn on Legends of Tomorrows, Ryan’s Constantine even got his own animated show—which is now being turned into a movie.
The CW launched the first five episodes of its Constantine series on its CW Seed streaming service earlier this year, but it left Constantine’s latest adventure—helping an old friend save his daughter from a mysterious demonic coma after a tragic accident—unfinished. Now, on top of the material released as those five episodes, it’s been turned into Constantine: City of Demons, a 90-minute movie that actually finishes the story the show began. [Source]