Black Panther: 11 Implications For Infinity War
11. A New & Improved Bucky
Black Panther's post-credits scene reveals that Bucky (Sebastian Stan) is still residing in Wakanda, and from his brief interaction with Shuri (Letitia Wright), it's heavily implied that his prior brainwashing has been completely fixed with the help of some unknown, advanced Wakandan technology.
Shuri also tells Bucky that he has "much more to learn", which seems to tie perfectly into the fact that he has a new arm in the Infinity War trailer, which is presumably made out of Vibranium.
That's without even mentioning the general physical upgrade he might've received from consuming any of Wakanda's herbs - assuming any were able to re-grow - during his recuperation period.
Simply, Bucky's going to be stronger, tougher and just plain better than ever.