I do believe that the Egghead arc will probably be around 30 to 40 chapters now.
Both Kizaru and Kuma are about to arrive very soon.
We still have to see a Kuma and Bonney backstory
Hopefully a MADS backstory as well
And of course I still believe that characters like Doll, Tashigi, maybe Smoker, and members of SWORD will still play some role as well.
Other than those, who knows what else Oda could add during this arc.