I love how this trailer works. We hear no dialog, only Joe Hisaishi's wonderfully romantic musical score. We see no thrilling action scenes or breathtaking visual effects, only a seemingly ordinary scene of an old woman cleaning a rustic house. The text describes the setup and nothing more. We are invited to immerse ourselves in the moment.
Of course, when Hayao Miyazaki is the most successful filmmaker in this history of Japanese cinema, you can forgo those old conventions. There's no need to sell anything. The theaters are already packed.