It can be a pretty good possibility flood come back. Though I hope in a more advance way than it was in Halo CE and 2. Halo 3 did many other designs and variants but can only go so far without dying pretty easy.
I think I would like the flood the come back in a Halo Wars 2 design and Left 4 Dead. Not so gruesome and screaming but more of the very excited and motivation to kill you type. That would bring some fear back into me fighting them.
I would love to see the halo wars 2 flood in first person.
I would really just prefer the classic types of flood which are the regular quickly infected mobs but in addition to those there should be different flood forms too like pure forms or the juggernaut.
And hopefully those yellow glowy parts were just there for RTS visibility, I just dont want to see that on an FPS.
I want the Combat Forms to be as tough as they were in Halo 1, they were too weak in Halo 3. I also would like to see those Flood Forms from Halo Wars 2, the ones that roll and you see fight the Brutes in the cutscene.