1. "Captain America 4" is in development, with Anthony Mackie set to reprise his role as Sam Wilson, the new Captain America. The film will likely explore Sam's transition into the iconic superhero role, as he takes on the mantle from the previous Captain America, Steve Rogers (Chris Evans).

2. The article suggests that Sam Wilson's Captain America may don a new suit of armor, potentially made from the rare and durable metal adamantium. This could provide him with enhanced protection and capabilities, allowing him to better fulfill the duties of the Captain America role.

3. The introduction of adamantium, a material closely associated with the X-Men character Wolverine, could hint at the potential for a larger Marvel Cinematic Universe crossover or the integration of the X-Men into the existing MCU narrative. This could open up exciting new storylines and character interactions for future films.