Some of the info has been shared during the WordPress Lausanne meetup group on 20 October 2022, but additional content is added here and modified over time
Gutenberg phases
4 phases, multilingual for the phase 4, Matt is vague when asked about ETA, for example during each Q&A at WordCamp Europe
Plugins
If you need a different languages, a plugin will generally make the link between the same content in different languages, some will include machine translate possibilities, some will allow manual modification of machine translate and some other plugins have different purpose than content translation, such as theme and plugins text strings translation for example.
Approaches to content translations
In the same post
in the same site in different posts
on different sites, same multisite
external