It's legit. The leak is real.
The unseen Infinity Space Lanes Captain's name is Rupert Crandall (commands the Inside Straight, which is a broken ship). Kestra IM's him at the dinner table and he tells her the location of Soji's homeworld ("in the Vice Sector, the Hoolian system. Planet doesn't even have a name, just a number.")
The episode is really, really sappy, but it's a reunion episode, so understandable. I'm like Picard in that I don't like kids onscreen, so sorta tuned out the Kestra-Soji stuff. The dead son's full name was Thaddeus Troi-Riker, per a trophy, so I presume Kestra has a similar double barrelled surname.
And here's the part where no one will believe me: When Picard winds up on the Troi-Riker homestead, he mentions that he's in danger. Riker immediately raises shields (and we see the flicker of force field lights outside, implying a very close shield... although we later see them cook and eat pizza outside) and says they've been in danger before. Picard says its Romulans, so Riker initiates anti-cloaking scans, whatever that might be. But before that he mentions who caused the danger before, and I think he says Kzinti.
That doesn't make sense, copyright-wise, so I presumed I misheard Xindi. But upon relistening, it's definitely multiple syllables like Ka-zin-ti. Maybe it's a new race that sounds like that. We'll know for sure on Thursday when a copy of the episode is released without Japanese subtitles. But if it is the first post-1973 reference to the Kzinti, that is going to be a big deal for some people.
Nepenthe is mentioned to have regenerative properties (a little like the Ba'ku planet, I assume), and that's why they moved there, because their son was dying of Mendaxic neurosclerosis ("MN"). MN is a silicon-based virus that is rare and curable if the "infected cells are cultured in an active positronic matrix." Which of course, were banned by Starfleet. Although Nepenthe, due to the Kzinti reference before, seems to be outside of the Federation. Maybe.