Possibly. I do agree that we will see a new upgraded technique, but I've been leaning in a different direction to fit Elbaph.
Wano overall had a flame theme: Kin'emon's Foxfire Style and Zoro later learning it, the animal life having flame-like appearances (Komainu, Komashika, Komatori, Onimaru, etc.), Lunarian flames, the Fire Festival, Ifrit Jambe, KOH's hell flames, Sun God Nika, and Momo mastering Flame Clouds.
For Elbaph, the sword attacks of the giants (like Hakoku) and even Xebec's are highlighted as shockwave-based forces. So, I think we will see an upgraded Pondo Hō technique from Zoro. Like Big Mom's Ikoku, it could be Zoro's own variant of Elbaph's Hakoku.
Santōryū: Senhachijū Pondo Hō
Three Sword Style: 1080 Pound Phoenix
En-Ō Santōryū: Enkoku Hō (閻王三刀流閻国鳳)
King of Hell, Three Sword Style: Enkoku Phoenix