Vibranium: The material that Caps shield is made out of is the weapon of the Black Panther. A main deposit is found in Wakanda, the Panther's home. Perhaps Howard Stark got some from the first Black Panther? The metals inclusion could lead to a Black Panther movie, something many are waiting for.
The Flying Car: Howard Starks flying car could be the gateway to a 2099 movie. A corrupt government, new takes on famous heros, and increased tech could make for a good movie.
The original Human Torch: A blink and you miss it moment at the beginning of the Technology Expo showed what looked like an android. This could have been the original Human Torch. An android, that, when exposed to oxygen, would light on fire. Another 1940's movie would be fun, especially with a robot that lights on fire.
The Avengers: Do I REALLY have to explain this one?
The Winter Soldier: In the comics, Bucky didn't die. he lost an arm, and was brainwashed. He became an an assassin. Could this be Bucky's fate in the MCU?
Civil War: Now that Cap has been introduced, could we have war? Companies have worked together in the past right? We may have to make this away from the other movies though. Keep the actors, drop the movies that were previous to this one.
Cap has brought us a good movie, and hopefully he has set up more.