So, let's make some predictions!
Since there are several plot threads I don't know in which order Oda will cover each, I'm covering a range of 3-4 chapters, not just Ch 1089 here.
Let's start with that last panel of Ch 1088. Ch 1078 had already revealed that the the resolution of this "Egghead Incident" would happen in the following day. So, what Ch 1088's end entails? It means Kizaru and Saturn have not arrived yet. Remember, the marines are coming from all over the New World, so some are arriving early.
The world thinks Luffy "barricated himself" in Egghead, leading to the marine siege. This is part due to Morgans spinning the story in favor of the government. But there's more to it: we know Vegapunk wanted to just leave ASAP, and the world doesn't know there's a rogue Vegapunk.
So, what's actually happening is that the Straw Hats failed. At best, they are being stalled. At worst, they lost the battle. Had they won, no matter how late, they'd skedaddle before the marine siege is ready. They can't.
The one barricated in Egghead... is York!
These earlier marine arrivals, which I'll guess are those coming from the nearby G-14 base, led by Vice-Admiral Doll (and maybe Vice-Admiral Smoker), will be stalled by the island's defenses: Cyborg Sea Beasts, the Mecha-shark, the Pacifistas Mark-3, and other unknown measures.
Meanwhile, the Straw Hats will lose their battle. Maybe we see the last few moments of the fight, or maybe the story rewinds time to show what happened. It doesn't matter: most of the crew is defeated, there's only a few survivors. I covered it in more detail here, so I won't repeat that whole post.
Meanwhile, York will put her plan in motion, and this includes bringing Bonney to her side, to turn the Seraphim into adults. In exchange, York would promise to restore Kuma.
Also, I think there's another Vegapunk allied with York.
So, in short, the events I think we will see over the next 3-4 chapters:
- Sanji and Nami are petrified.
- Atlas brings Robin and Chopper to York and betrays them, revealing to be on York's side (and maybe also being the real mastermind).
- York locks all hover boots
- Zoro and Jinbe are taken out somehow.
- Luffy and Lucci are pushed beyond the Frontier Dome and are shoot by the lasers, falling down to Fabriphase.
- Amid the marines fighting the defenses, a mysterious person arrives at the island.
- York seeks Bonney with a proposal.
It will be under that chaos that Egghead Island will reach peak speed. The remaining Straw Hats have a dozen hours or so to save the crew and find a way to escape the island. The countdown for Kizaru and Saturn arrival begins...