The transfer of the yandex․ru main page is due to the fact that News and Zen, which are passing under the control of VK, are inextricably linked with the Yandex main page – it is from there that both services receive the main traffic. In addition, this page itself for the most part consists of the content of these services.
Yandex, on the other hand, will develop ya.ru as its new main page. After the transaction for the sale of content, and projects is closed, it will become the main entry point to Search, Mail, and other company services, including the personal account of the Yandex ID user.
You can already see what the new main page will look like on new.ya.ru.