What could that mysterious ability be?
The title of One Piece chapter 1037 is tentatively translated as 'Sake Dragon Eight Wonders,' a skill name similar to the Thunder Dragon Eight Wonders previously used by Kaido. This week's cover art continues the journey of the Germa family after escaping from Big Mom. Currently, Reiju is with her father and younger brother sitting in front of a heavily damaged wall.

Chapter 1037 kicks off with scenes unfolding in the Flower Capital. The Fire Festival is also nearing its end. It seems the people in the capital have yet to realize that an island is about to land on their heads.
Switching to Luffy and Kaido, a significant part of this chapter involves their battle. Feeling exhilarated while fighting Luffy, Kaido engages in combat while drinking sake.
The name 'Sake Dragon Eight Wonders' represents Kaido's fighting style after drinking sake. After consuming alcohol, Kaido unleashes a series of techniques corresponding to his various emotions of joy, anger, love, and sorrow.
Kaido: Army of Flourishing Virtues!!! (The Army of Flourishing Virtues – Gundari, is one of the Esoteric Buddhist guardians and embodies wrath)
Luffy: Roc Gatling!!!
Transitioning to the top of Pangea Castle in the Holy Land Mary Geoise.
At this moment, all 5 members of the Five Elders are in conversation, with one noting that the current situation resembles when Nico Robin was captured at Enies Lobby.

The Government's fleet has now closed in on Wano Country and is awaiting the outcome of the battle between Luffy and Kaido.
A Cipher Pol agent reports to the Five Elders that a mysterious large shadow has just been discovered.
All five individuals also discuss a certain devil fruit. Now that devil fruit has become a legend even acknowledged by the Five Elders, as it has never been awakened in hundreds of years.
Cipher Pol wonders what devil fruit could be so terrifying that the World Government had to give it a different name to conceal it. According to spoiler information, this devil fruit's ability is likely not Luffy's Gomu Gomu but an entirely different power.
The identity of that mysterious large shadow is revealed on the final page of this chapter. It's highly likely to be Zou, and Zou will help Momonosuke elevate all of Wano on its back.
Due to the overlap of the New Year holiday and regular breaks, Oda will continue the break next week, with the latest chapter in two weeks, on January 24th. Spoilers will likely be out a few days earlier, around January 20th or 21st.
Source: Association of One Piece Sleep and Eaters