I'd be surprised if they're doing a Kenobi movie. They seem to be putting the PT behind them (even if Ben is an OT character, McGregor makes it closer to the PT perception wise). Besides, I get the idea that the anthology movies are the non Jedi movies (though people with special powers does fit in Trank's wheelhouse).
I would love to see a Kenobi movie though. But Boba Fett makes more sense. A fan favorite character who hasn't actually done anything on film.