It probably was not intentional, but a spoiler slipped through cracks on Captain America: Civil War for anyone who was obsessed enough to painstakingly watch the trailer frame-by-frame, or read a post like this reaping the benefits of that obsessive fan.
Check this out, via Uproxx:
Do you see the spoiler?
No, I wouldn’t have either, if I didn’t know what I was looking for. But see that body lying on the floor behind Captain America’s head. That’s Bucky Barnes. Bucky, as you can clearly see, is missing an arm and looking vaguely corpse-y.
Does Bucky Barnes, the Winter Soldier, die in Captain America: Civil War?
It appears that he may.