If you don't want to know anything about what you might see in the post-credits scene for Captain America: The Winter Soldier, then I suggest you stop reading now.
You've seen the trailers, so you know this movie not only looks like a sequel to Captain America, but it looks like it could be a sequel to The Avengers as well. So it should come as no surprise that the post-credit sequence would lead us into Avengers: Age of Ultron. The following information comes from Lainey Gossip, who has already seen the sequence. Here's what they say:
… there’s a big reveal that general audiences won’t see coming (and ought to open some doors to fix that awful SHIELD show). But the thing that’s probably going to leave people talking the most is the post-credits stinger. They’re calling them “The Twins”, the brother-sister team of Quicksilver and the Scarlet Witch, and they don’t look like any Marvel heroes we’ve met to date. Having seen them, I am really sad for Fox and the X-Men.
They go on to say that, in comparison, the stuff Fox and Bryan Singer are doing with X-Men is "outright embarrassing." Damn, I'm already crazy excited for The Winter Solider, and now there's this to build on it! I have no doubt that once again, Marvel is going to blow away their fans.
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