Well it does seem like Killer and Kid just continued to follow their log pose, but who knows. Personally I don't see why it shouldn't be Elbaf, it's not like the SHs have anything else to do that I can think of.
Also we don't know if the Kuma plot is over, what if Vega transferred Kuma's brain unto a different body and he is that person? But yeah it seems this arc is on it's last chapters
Oh i definitely agree Elbaf is coming, i just wonder if its exactly "next". Like maybe we have something else in between, cause im not sure if the island order post wano was meant to be exacty linear with only the 3 options.
I actually still think Law was heading for Fullalead. During his fight for BB, he does mention being forced to surface and land on Winner Island, suggesting that wasnt their destination:
And yeah, not sure about the Kuma stuff just yet. Egghead certainly was made to give Vegapunk a location to reside at least. I think one chapter will be dedicated to this Kuma revelation and another to this mystery person. Assuming Kizaru isnt stopping them directly on Egghead, then yeah, they may leave the island in the next ~5 chapters or so.