So..here's some of my points:
1. Unohana is 100% dead. Otherwise the whole concept Unohana stated would be pretty useless and irrelevant
2. I agree with Gobee with his idea of Shinsui/Ukitake with one of them dying..I'm pretty sure one of them will die as well..I'm gonna go for Ukitake mostly though..just a hunch I guess. Shinsui has just been promoted and considering Yamamoto's longgg time being captain commander it would somewhat be a proper ending if there was stability in terms of their leader.
3. Kensei and Rose + Hitsugaya - So we have three zombies but one of them has not been zombified after death but prior to death. This should thus confirm that Kensei and Rose are indeed dead and beyond "unzombifying" whilst Hitsugaya can still be brought back from his zombification through Mayuri's experiments. It's like Kubo left a possible escape route for Hitsugaya but in doing so he eliminated any escape routes for Kensei and Rose. The only way that they would survive this would be that Gremmy was in fact kidding about their death and Unohana's vice captain made a mistake in analysing them..or else Gremmy was imagining they were dead for a few minutes and thus they were..dead at the time.
4. Once again I agree with Gobee with regards to Byakuya not dying. Having him come back to die again after his "death scene" would just be repetitive and devalue the initial death scene.
5. I see Isshin dying as well. His death would be very influential on his son whilst also being relevant to the story between Quincy/Shinigami due to Bach's influence on Masaki's death.
6. I don't see Zaraki dying at this point. He was hyped as hell having finally unleashed his potential..and its still very far off from being his true complete potential. He was a huge letdown after having had Unohana's death happen at his hands and simply falling down at Candice's feet after Gremmy. There's still way more to be seen from Zaraki and thus I don't think he can die at this arc. Unless he simply goes all out at the end dealing a huge blow to the opposition and dying a sacrificial death..which I don't see happening right now.
7. I don't think both Yoruichi and Urahara will die...one of them most likely. If the final fight turns out similar to the initial fight with Aizen with Yoruichi, Urahara, Ichigo and maybe Isshin..I can see maximum two deaths with Isshin and Urahara falling to save Yoruichi and Ichigo..then again it looks more likely to me that Urahara survives more than Yoruichi..but I still think 1 of them is likely to die.
8. My first option of dying would have been Love..but now that I think about it..it seems to me as if his death would be quite..irrelevant? Don't wanna sound like I hate the guy (not that I particularly like him) but his death would lead to very little importance to the story the way I see it. Fine, Kensei and Rose probably died but they played a major part after death in the current story progression. Love is currently away from action and the whole zombie part would be far gone and probably so would nearly all fights apart from the major one. The way I see it he's been so pushed aside from the main story (like a third character more than a secondary one) that his death would be quite useless both in terms of story progression and emotion..
9. Got a hunch that Shinji will die considering its the complete opposite of Love. Leader of the Visored, Captain and a pretty badass Shikai :3 I really don't want him to die but meh..
10. Komamura? - that's a hard one..initially I thought he'd die because he practically lost the only aim he had in life that of aiding Yamamoto and devoting his life for him. Now the link with his relative kinda confused me a bit. I'd say he won't die even though he has all the reasons to do so considering his main aim is now gone.
11. Aizen will have to die. He will have to become important in this arc otherwise the whole "not killing Aizen" and imprisoning him thing would have been useless. Why not kill him after he pledged war against the Soul King himself? 20,000 years in jail is a joke. He will maybe accept Bach's help and he will eventually die..otherwise Bleach just won't be able to end at all. Aizen is too smart to be let alive.
Am I forgetting someone? I don't see Mayuri dying..and well..I hope Sui Feng does xD So any reason stated by me saying Sui Feng will die will just be me giving my hopes a material form