Last year early product listings surfaced giving clues that we’d be seeing more catalog 4K Marvel movies released in 2019. So far every new release since Guardians of the Galaxy Vol. 2 has been released in 4K and Disney has issued the previous two Avengers movies on the format. A listing for a 4K Doctor Strange for this month turned out to be in error as it was just a re-issue of the standard Blu-Ray in 10th Anniversary packaging, but now it looks like Captain America: The First Avenger is confirmed for release next month.
Best Buy has posted a listing for the 4K release of Captain America: The First Avenger and it will be available in a steelbook there, just like the previous MCU 4K releases were:
The release date is posted as February 26th, and right now there’s no sign of The Winter Solider or Civil War listed for 4K, but hopefully we’ll get those later in 2019 to complete the trilogy.