Sup, folks.
Here we go, only 3 days left before S7 premiere. And i think it's safe to say, now we have all avaliable info about upcoming episodes from all sources. So, here are my speculations and hypothesis about most likely events:

Part 1 - First arc (few episodes):

- Oscar and Jason are not the main villains in first arc.

First of all, I think promo and trailers mislead us, making us think that the main villains of the first episodes will be Oscar and Jason. I think it's just a bait. Here's why: In last trailer Nyla says about "two of the most dangerous man we have ever arrested"

I am sorry, but it's completly wrong, if she speaks about Jason and Oscar. Yeah, Oscar is a dangerous guy and even killed people before, but he's not even close to be THE DANGEROUS out of all criminals from the past seasons. And Jason is simply a joke. He's not even a threat to anybody, just annoying ex-husband and fraud (obviously John will count him as threat to Bailey, but in a big scheme of things, Jason is nobody).

I don't know who will be the main villain in first arc exactly (hope it's not Elijah) but i'm pretty sure it won't be these two.

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- James possible death/major injury.

Some people think Lopez, Wesley and Nyla crying over Aaron death. I don't think that's it. He's fine and just switch departments (as Lucy said newbies often change their facisilities after Rookie period). I think the real reason everybody crying is James death / major injury. We see Nyla in hospital robe and with brooses, my guess they were attacked at home and he was probably shot.

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- Oscar will survive 100%, Jason probably will die.

Both, Oscar and Jason will be caught, even if they are not the main villains in first arc. Oscar probably will betray Jason, as he always do to save himself. Jason will die, but not by main characters actions, but due to his own flaws. He might be killed by other criminals, or simply get hit by a truck, running from Nolan. IDK

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- Chenford will not happen until later in the season.

Chenford fans should not be aroused too much, creators will not let you enjoy your OTP from the start. There will be tenison and tease for viewers, but complete reunion only in 2d half of the season. (And i'm not even sure about that either, maybe there will be no complete reunion at all in S7)

Part 2 - Later in season:

- Lieutenant Wade Grey and his family drama.

Grey promoted to LT for his previous records and final straw - succesfully first s7 arc. Maybe there will be little secondary drama arc about him and his wife in some episode. Because she wanted him to retire long ago and he promised that he will. And now he got promoted and clearly want to stay on duty. Maybe she won't be really happy about it. But eventually it ends well, obviously.

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- One of two new rookies will fail and lose job.

Okay, listen me pls. I genuinely think 2 new major characters is too much for the show. We obviously need 1 to replace Aaron, so i think first half of the season (just before hiatus) ends with one of two newbies fails and kicked out of programm. I don't know who, but think it will be Tim's rookie. That event will be another Tim failure and affect him even more. Previously he failed as Metro leader and boyfriend, now he fails as TO. I think his character needs to hit the rock bottom before rise up and reborn again in 2d half of the season.

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- Nolan and Bailey 2 kids

I don't have any proof for this prediction it's just my inner sense. Nolan and Bailey will take child from foster home to adopt and then will find out Bailey is pregnant. So they will have an adopt infant and upcoming baby.

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So, that's it. I might be completely wrong, or partly right, I dunno. Hope we'll find out together, guys.

Peace!