Hi Anat,
Yes we are planning to expand summaries fairly soon.
I think it is very legitimate and extremely helpful to match the summary to the language the user has selected for the interface. (if this selection is enabled)
Is your specific use case a multi lingual forum? Or is it allowing users the freedom to consume content in whatever language they want?
We already have summaries working in such a way that they attempt to stick to the language selected in the forum (eg: if forum is English and people post in another language, the summary will still be in English). That said Gemini Pro 1.5 and Flash have been a bit tough to hone in this department.