Okay here's what I anecdotally consider the threats we can expect to see in the hulk ranging in threat level: the top being the most dangerous to the bottom being the least. Just something to potentially refer to, and most of those are just from my opinion.
Genestealers
Daemons(unlikely)
Hrud
Corrupt automata
Umbra
Orks
Rak'gol
Ambulls
Cultists
I feel it's safe to say that genestealers are probably the biggest threat since their claws are absolutely capable of damaging necrodermis and are fast enough to dance around the stupid warriors and we'd need to build our strategies to fight them.
Conversely, the cultists are at the bottom since well, they are cultists, the equipment and wargear they are bound to have is most certainly godawful and baring something like a scavenged power sword as a relic, they likely will be toting around stub weapons, autoguns as most.
Edit:Actually
@VoidofEyes I just remembered a point, how will unaligned stuff work? Like normal aliens that don't belong to any faction work? Will we get them on a case by case basis? Like the ur-ghul, ambulls, medusae, etc. Like, I feel there's a lot fo potential not just from a gameplay standpoint but story as well, I now want to see how the q'orl would work.