It looks like Toho is starting to release Kurosawa’s films in Japan as 4K Ultra HD Blu-rays, with Ikiru and Stray Dog coming out tomorrow (March 15, 2023), with other films following later this spring.
The releases announced so far seem to be:
- Stray Dog: March 15, 2023
- Ikiru: March 15, 2023
- Yojimbo: April 19, 2023
- Sanjuro: April 19, 2023
- High and Low: May 17, 2023
- Kagemusha: May 17, 2023
As far as I can see, these don’t really include extras, other than the original trailer and a photo gallery. No English subtitles are provided either, but at least Japanese subtitles seem to be included.
You can check Amazon.co.jp for more information about prices and availability.