After Secret Wars, Marvel will go to a "tv seasons" type of publishing. All books will start with #1. Some characters will hold over from Secret Wars into the new Marvel Universe, some will change.
Doctor Spectrum of the Great Society, a holdover from Jonathan Hickman's "Avengers" run
Citizen V -- originally the "heroic" alter ego of Baron Zemo -- in his original Thunderbolts uniform
Thing and Rocket Raccoon, sporting matching Guardians of the Galaxy team uniforms
While it may not look like him, Marvel has confirmed that that is the Inhuman Karnak rocking a street-level look
Hyperion, another prominent player in Jonathan Hickman's recently concluded "Avengers" epic
"Inhuman" protagonist Inferno and, just on the other side of Iron Man, an unchanged Inhuman ruler Medusa
Daredevil sporting a new black and red costume, possibly a nod to the dark duds the Man Without Fear wore in his Netflix series
X-23 -- confirmed by Marvel -- in her new Wolverine-esque suit
Star-Lord, same as before "Secret Wars"
A mostly unchanged Doctor Strange, except this time carrying a massive battle axe
And Old Man Logan, possibly one of the characters surviving Battleworld and continuing on into the new Marvel U
Maestro will remain
A new Hulk not Banner (could be female)
Spider Gwen will stay in her own universe, but come back and forth