Judging by his interaction with CIA agent Everett Ross in the first Black Panther trailer, he’s become mentally unhinged since then, but he’ll nonetheless pose a threat to Black Panther, his allies and all of Wakanda.
Ulysses Klaue made his MCU debut during Avengers: Age of Ulron when Ultron took Klaues’s supply of vibranium in exchange for tremendous financial compensation.
Like his “Klaw” comic book counterpart, Andy Serkis’ Klaue will also use an arm cannon, which in this continuity is made from Wakandan mining equipment.
However, when Klaue noticed the similarities between the robotic villain and Tony Stark, Ultron freaked out and ripped his arm off, and the weapons merchant limped away as Earth’s Mightiest Heroes arrived on the scene.