If they stay true to what was said in Breaking Bad:
1. Gus thinks Lalo is dead
2. Saul thinks Lalo is alive
3. Ignacio's fate is unclear-- Saul says "it wasn't me, it was Ignacio, he's the one!"
At this point, Gus thinks Lalo is dead. Maybe he wants it to stay that way, and he operates behind he scenes in season 6, and beyond, and we'll see him in Omaha in the post-Breaking Bad timeline. Or, perhaps Gus will learn that he survived, but Saul won't, and Gus will kill him, for reals this time.
Ignacio? He might die, or he might live and "get out of the game," as he wants to do.
Kim? She might die. She might also be the reason Saul meets Robert Forster's "disappearer," and he has to say goodbye to her forever. Or, he tracks her down, and she shows up in Omaha.
There are a lot of directions this can go, and I can't wait to see how it is all resolved.
Clearly Ignacio is going to be the fall guy for quite a few things related to the Salamanca's. But for sure what we know is Lalo is dead by the time the twins get killed. there is no way Lalo would stay gone in such a situation, nearly his entire family except hector getting killed and Gus getting more powerful.
Kim I am not sure what will happen. but for sure it can't be to dramatic of a fate; because Saul is not all torn up about her in Breaking Bad. They have to break up or leave each other in such a way he can sort of joke about it during breaking bad; he makes some jokes about his ex-wives in BB. he would not be able to do that about someone he loved if they were killed or disappeared under really dramatic circumstances. But who knows for sure.