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If the film is made, Chris Evans will star again as part of his six picture deal, and Kevin Feige will produce. The directors and Marvel are working on a story outline for the film.
With Marvel’s slate of untitled but claimed release dates (see "More Marvel Movie Moves"), and the fact that it took nearly four years between Captain America: The First Avenger and Winter Soldier (allowing for Marvel’s The Avengers and 2015’s Avengers: Age of Ultron), it’s a fair bet that Cap 3 will fit nicely in that May 5, 2017 "Untitled" spot on the chart.
Captain America: The Winter Soldier opens on April 4th (see "First 'Captain America: The Winter Soldier' Trailer").