I'm done with S5, Steven Knight didn't go against history, I'm expecting the same in S6.
We don't know who Mr. Jones (The Anti-Christ) is but he's left Tommy Shelby in a bad way. After Al Capone went to prison, Tony "Big Tuna" Accardo took over his Outfit. That means the chances of Michael Gray taking over the Great Lakes distribution are less than zero, his arrogance masks his stupidity. We don't know Gina Gray's back story, she may still be Ulster - certainly not iRA. Part of the pleasure of S6 is watching ATJ flesh out the character, she's an extremely dangerous woman. How will Tommy Shelby adapt to survive, that's another story.
Steven Knight said in an interview that he and Chips Hardy have a finished script for S2 of Taboo, Venom2 has wrapped. However Tom Hardy has committed to another film called
The Things They Carried, co-starring Billy Skarsgard (It 2) and Pete Davidson (SNL) - who knows when he'll get to S2?