During Thor: Ragnarok, Hela infamously displayed her level of power by not only stopped Mjolnir with one hand but also destroying it. This was a moment unexpected by most that went into the movie blind and upon rewatching Thor: Ragnarok, it stood out as no one was shown collecting Mjolnir’s remains. The Russo Brothers have said on multiple occasions that one of their goals with Avengers: Endgame was concluding plot lines from as many movies as possible.
This would ideally be a goal for characters that may not get future films in the next wave of MCU films such as Iron Man, Captain America, and Thor. Because of this, it wouldn’t be too far fetched to wonder if they’ll touch upon the several chunks of Uru metal currently sitting in Norway.
Uru in the Marvel Cinematic Universe has been used as a material which creates powerful weapons. These weapons include Mjolnir, Stormbreaker, and the Infinity Gauntlet. It would be interesting to see if the Uru materials are repurposed in Avengers: Endgame to help defeat Thanos. The most likely members to utilize the metal would be Iron Man or Captain America.
Iron Man because he could study and utilize the metal to find a flaw which can be exploited while Captain America because it could provide him a powerful offensive weapon to complement his shield. Captain America utilizing a repaired Mjolnir or Uru weapon would be a nice way of rewarding the tease from Avengers: Age of Ultron. Thor wouldn’t likely have an interest in a Mjolnir or random Uru metal weapon considering he has Stormbreaker, which was stated to be Eitri’s most powerful Uru mold for a weapon.
With Iron Man, the best opportunity for him to incorporate Uru metal would be with his armor. This could be an enhancement and explain the grey parts on the new Iron Man MK LXXXV (85) armor shown in recent trailers. Producing either an armor made from Uru metal has been a fandom dream for years. Many thought it would be shown in Avengers: Infinity War when it was initially revealed certain scenes would take place in Nidavellir.
In the comics, specifically the Fear Itself storyline, Iron Man was able to upgrade his Bleeding Edge armor with Uru metal. Deemed the “Iron Destroyer” armor, it held the standard enchantments Odin provided Asgardian Uru weapons until the battle against Thor’s uncle concluded. Iron Man then returned the metal to the Dwarven forges.
The Uru Armor also appeared in the animated series, Avengers: Earth’s Mightiest Heroes, providing him magical abilities along with augmented energy projection. While I doubt we would see an armor completely made from Uru metal in Avengers: Endgame, it’s worth noting that Christopher Yost was involved with writing not only this series but has written Thor: The Dark World and Thor: Ragnarok. Potentially he may have consulted with the Russo Brothers or Kevin Feige regarding the idea.
Iron Man utilizing an Uru-enhanced armor after introducing his Bleeding Edge inspired armor would make sense. It would be a nice reference to the comics, and explain why the grey on this suit doesn’t match previous grey colors he has used on armors such as the MK XLVII (47) seen in Spider-Man: Homecoming. To play devil’s advocate and argue against Uru metal being used with Iron Man’s new armor, it’s worth mentioning that Captain America: Civil War featured the MK XLVI (46) armor featuring grey sections.
These sections aren’t the same exact shade of grey but somewhat similar. The other issue Tony Stark would face is making the Uru metal components of the armor responsive to the nanotech and/or being able to convert the Uru metal into nanotech parts. If he could, this armor may be the most dynamic armor ever seen in the MCU outside of a potential Vibranium armor outfitted with technology from both Tony Stark and Shuri.