Sebastian Stan recently posted a photo of himself on Instagram showing off a Winter Soldier-themed shield that was created for him by Casey McBroom of Shield Labs, who creates these customized shields for fans and cosplayers. As you can see, this one was designed to look like Winter Solider's metal arm.
Fans have already started to speculate that this might mean something for the character in the upcoming Avengers sequels because he included this following caption with the video:
"Excuse me...where's the restroom?" A big thank you and shout out to Casey McBroom @shield_labs for making this for me. Will come in handy... #wintersoldier #marvel
It's the "will come in handy" part that makes people think the actor is teasing something about his character possibly being the new Captain America. I don't think that's the case at all, though. This isn't a prop from the movie, this is just a wicked cool customized shield that was made for the actor, and he's clearly just showing it off.
A photo posted by Sebastian Stan (@imsebastianstan) on