According to Cartoon Base, BEN 10 creator Duncan Rouleau to make an adult animated Ben 10 series.  Rouleau made reveal during is Revive Ben10 event on X (Formerly Twitter). 

“Absolutely. It would be great to have a high stakes show that offered more mature themes. Not so interested in gore or sexual content, but dealing with emotional, social and political elements that the MCU movies deal with would be exciting.” 

Ben 10 animated series first ran from 2005 to 2008). A sequels Ben 10: Alien Force aired from 2008 to 2010, followed by Ben 10: Ultimate Alien which aired from 2010 to 2012 and Ben 10: Omniverse from 2012–2014. A reboot series, also titled Ben 10, was released from 2016 to 2021, set in its own continuity, with a 44-minute finale special serving as a crossover with the first four series.