Though fair warning the client (and server for that matter) are a bit janky by end-user standards.

Apple has not confirmed one way or the other. Go find where they have. (Totally possible it ends up being iPhone-only, but again, not confirmed.)

Y’all need to stop spreading this, until it’s actually confirmed one way or the other. The only thing that has actually happened is that the first beta of iOS 17.2 only had the journal app for iPhone.