For my prediction, I think Kate is going to survive the crash, but with serious injuries (I am starting to see a pattern of Kate getting hurt). Now, if Doctor Lingard was spared, Kate will survive, or at least be in stable condition to travel. If not, Kate isn't going anywhere, and she might have a chance at dying. If this does happen, David is going to be pissed at Javi and Clementine for not only sentencing his wife to death, but for killing one of his friends. Gabe might start to hate Javi after this too. Clementine will start to defend you, but then Gabe and David might start questioning Javi's loyalty to his family, and whether he truly "grew up" since David last saw him. Kate might defend you, whether you went with Kate during the shooting after Marianna's death, or agreed with her on leaving Richmond with the family.
About deaths, I don't think Javi and Clementine are going to die, since they have too much potential and (at least Javi) have not been taken to their conclusions yet. I do not know about David, since Clementine has been foreshadowing David's inner personality for the entire season, and so has Kate for that matter. it seems to me Javi only knows one side of his brother, and since he was never that close to his family, maybe he is blind to what David truly is. If I am correct on this, I fell into this trap as well. Depending on your choices, David may try to kill Javi if he tried to abandon him in Above the Law, and if Javi confessed his love to Kate in Thicker than water. It seems that this season's theme was mainly about family, so this would fit it quite nicely. I do not know if Gabe is going to die or not, maybe it will come down to who he respects more, Javi or David. If Gabe sides with Javi, David might go full savage and Gabe might have to kill him as he is about to kill Javi. If Gabe trusts David more, then he might get killed in another gunfight by a stray bullet or something. Due to grief, David might kill himself due to losing both of his children.
I think Eleanor is going to be determinant, since the group might catch up with her. If you decided to try to spare Tripp, she might be more sympathetic, and regret trusting Joan. If you didn't, and decided to spare Ava, she will absolutely despise you. Regardless of how you feel, either you or David will kill her (depending on who was executed). If Ava was executed, she might be killed by David for putting Ava in that situation. If Tripp died, David could probably care less, and the choice is up to Javi whether she lives or dies.