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It's not very clear. Is this only for G Suite / business customers or will regular @gmail.com users be able to use File Stream too?

Non G Suite customers can continue using the Google Drive app, it's just renamed to Backup and Sync: https://www.google.com/drive/download/

> Available to all G Suite editions

Sounds like only to G-Suit customers, maybe they expand to everyone at a later date.

I just checked my free (grandfathered) GSuite account and there is no option for it (yet?).

That's right. Grandfathered "Google Apps Basic" accounts get the regular Backup and Sync that @gmail.com accounts get.

A shame, but understandable. :)