The R rating isn't exactly a new thing for the superhero genre. The Blade trilogy did great business, and earned a lot of fans, by letting the blood flow long before superhero movies were the tentpole business they are today. That said, the R-rated superhero movie is definitely trending again. Fox has had tremendous fortune with Deadpool and Logan, and now Sony is said to be getting in on the game with an R-rated Venom.
This rumor comes from Collider, which is also reporting that the studio's new Venom movie will serve as a launching point for Sony's own Marvel universe (including the recently announced Black Cat and Silver Sable movie), which will be totally separate from Disney/Marvel's existing Marvel Cinematic Universe, including Sony's own Spider-Man: Homecoming.
That will no doubt be a bummer to fans, who would much rather see the MCU expand than splinter. Alas, that is unlikely to happen at this stage. The rights to all of these characters were diced up long ago across multiple studios and they are all trying to keep their own franchises going. We're lucky that Sony and Disney could reach an agreement on bringing Spidey into the MCU, but if this Venom rumor is true, then a lot of Spidey's friends (and enemies) won't be joining him.
And speaking of Spider-Man, here's the new trailer for Homecoming.
Spider-Man: Homecoming hits theaters on July 7, 2017. As of now, Venom is scheduled to hit theaters on October 5, 2018.