Google Assistant is evolving. Launched alongside the Pixel 4 last year, the newer Google Assistant is now touching new heights. Now you can go full Japanese with Assistant on a Pixel 4 in Japan.
Along with the Motion Sense update for Pixel 4 in Japan, Google packed this particular update as well. During the time of the launch, Motion Sense was not available, but now you can use the Pixel 4 to its full extent, with the new Motion Sense update.
On Assistant, if you enabled the Japanese as the only language, you will see the new minimalistic UI of the Assistant with all the new features such as Continous Conversation with Assistant and many other things. Do note, selecting multiple languages other than Japanese will not help at all.
The update is rolling out slowly, so have patience!
Source: Google Blog