Spoilery content that may or may not be true: It's implied Nami sent the officer after Nika and Summer when they went to the cabin, and that she might have had a hand in sabotaging their relationship. Noji has secrets, I don't think Nami is on on the big secrets that involve her and Nika - Noji knows Nami can't be trusted to stay silent. The current theories are that Noji is purposefully hiding Nika and Nami's parentage from them, and it's no accident that Noji is looking after them. Current theories about their parentage require playin Ocean's other game WiaB and trying to second guess Ocean's plots. The main thing is that there will be some connection with the Zane family, even if it is something like the Zane family in some way caused Nika and Nami to be orphans, if not being their blood relatives. Nami and Sasha's earring belong to a character from WiaB. Sasha is a Petrova, the earrings belong to Ayua's aunt - both Ayua's aunt and Sasha's mum (who owns the tennis club) are the Z and P in ZPR of the college. Nothing is known about why the earrings are given to them. We have no details of Nika and Nami's parents accident, but there are also the Frohns who had a car accident. There is a chance that there might be some criminal war going on and the parents were collateral damage, or everyone has lied to Nika and Nami to hide their parent's identity. The person in a coma is Bella's sister, the one that NIka triggers her by asking about earlier.
Regarding continuation/released, the full chapter 5 release should be soon, and that will add a bit more detail regarding the heist scene and the Holgersons. THe game has an anticipated 30 chapters or so, so we're a sixth of the way in. It will be a slow process, fingers crossed it speeds up, no date has been set, just the length of the game.
If you want more Ocean, check out his other game Where It All Began. It is set before this and you see some of the same characters when they we young - it happens in the same story universe. Ocean's developing both games simultaneously, so it's hard to say exactly which theories are true, but keep checking the thread, we tend to gossip over theories, because it's a pretty grand story.