Warning, potential spoiler ahead:
Granted, you really have to look hard though.
Take it as you may.
Ps: this is my capture and it was taken from the official marvel youtube trailer.
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A little hard to notice but it looks like the recent cap3 trailer actually spoiled something big. As you can (hopefully) see, it looks like bucky has his arm torned off and is lying on the ground behind cap.
Granted, you really have to look hard though.
Take it as you may.
Ps: this is my capture and it was taken from the official marvel youtube trailer.