I was curious and wanted to poke back at some of the pre-release reviews since there were some fairly considerable spoilers and I found this reddit post that compiled all of them.
It looks like the finale is going to be absolutely huge in terms of reveals, and I'm kind of surprised just how much finale stuff seems to have made it into reviews. Some reviewers don't seem so great at paying attention to details, and some reviewers who seemed to have only gotten 6 episodes and thought they got the whole season.
This review doesn't seem to have been mined very much by the reddit post writer, but with what we've seen of this season, seems extremely spoiler now. In particular, these bits:
If the series started as an analysis of work-life balance and an exploration of one’s identity in and out of the workplace, Season 2 has us pondering the very nature of humanity, dedicating equal time to the Innies and Outies and ultimately asking us: who would our Outies – Mark Strong, Helly Eagan, Irving Bailiff, Dylan George, and even Lumon managers like Harmony Cobel (Patricia Arquette) and Seth Milchick (Tramell Tillman) – have turned out to be without the trauma that came from the outside world? Who would the Innies have become without the loneliness that came from their confinement? If memories are what make us who we are, are each Innie and Outie the same person or are they two completely different people? And if the time came to make a choice, which one should keep living, and which should cease to exist?
And:
We (sort of) find out what the numbers are, we (sort of) get to meet Mark’s wife Gemma (Dichen Lachman), and something truly unexpected and iconic takes place in the finale that gives us an idea of what might come next.
And:
By the time the finale’s credits roll, you won’t have gotten all of the answers you were hoping for, but you will have been on a much darker journey to the very core of what makes us human, and left with an impossible choice to make that you’ll spend months thinking about. Season 3 couldn’t come any sooner.
Curiously, this review points out Reghabi as excellent? This makes me wonder if she'll be back and has some more, because I don't know if I'd say that for what we got of her to this point:
Jen Tullock and Karen Aldridge, who play Mark’s sister Devon and former Lumon employee Reghabi, are both excellent in Season 2, and both are essential to making the story as riveting as it is.
This review mentions:
One of the new season’s finest dramatic sequences features an “innie” and an “outie” arguing via increasingly heated, videotaped monologues.
Which we certainly haven't seen yet, and also makes me wonder if it's related to this quote from this review:
It’s hard to say whether Scott is at his complex best when trying to work out Mark’s feelings for Helly on the spot or manipulating and arguing among his various selves.
The Wrap's review also mentions
There’s a spectacular night-on-the-severed-floor montage that leads to some climactic realizations.
I'm not entirely sure if that's a reference to the Gemma episode or if it's something we haven't seen yet.
Yes, we sort of get an answer about what's going on with the famous baby goats, but that's not really the end of it, either.
Entertainment Weekly calls this out, too:
At least the goats’ purpose is made clear — or clearer, I should say — by the final episode.
And also has this bit, which I don't remember from the confrontation between Mark and Cobel at the car or in the most recent episode:
Of course, one very important mystery remains unsolved. “Why did you do this?” Mark howls at Ms. Cobel. “What the f--- is this all about?” The season builds to a wrenching and suspenseful finale which reveals some of the specific logistics of Lumon’s plan — but the endgame is still frustratingly cryptic.