Premieres December 28th. The new PV is here. Check out the ANN article for additional information. Synopsis from AniList:
Nobody asked to be a cat!
After dying in a fight against the forces of evil, a knight is shocked to discover that instead of being reborn as a hero of humanity, he starts his new life as a behemoth-one of the most powerful monsters in the world! The only problem is that a baby behemoth looks an awful lot like…an adorable house cat?! Things grow even more confusing when a beautiful elf adventurer rescues him from the brink of death rather than finishing him off. This house-cat-slash-knight’s baffling journey is just getting started…
I just flipped through a couple random manga chapters, and it is definitely ecchi (but no nudity). Of the four chapters I flipped through, three of them featured pages of a cat getting sandwiched by boobs.