Abyss is massive and really lurky, you will need any sort of passive info, and cypher/kj will be the best for that. Argument can be made for either as KJs lockdown is really hard to deal with, but her range issues are bad. Cypher can provide a lot of value, but then you lose the lockdown. With chamber you also get less info, range issues, and you are asked more to play with your util. Deadlock would require a special comp, her with any other sentinel could work, assuming you have a game plan to work with what you are missing out.
For smokes, it will either be solo 1 like omen or brim, or double with one wall smokes.
Dive duelists will excel imo, its a map with a lot of weird angles, and being able to abuse them with dashes or satchels will be for the best, especially because without a way to burst in to site, cypher and an anti flash set up would eat you alive.
Breach and Fade/Kay o imo are going to be the better ones.
So I think it will actually be played out really similar to Haven in terms of comp, but more classic haven then the Iso Neon revolution we are seeing.
IMO