Okay, this will be one of the most obscure new Kirby reprint mentions you’ll ever see. There’s a new Marvel Masterworks out, the fourth Avengers volume. The Kirby content of it is the cover of AVENGERS #33, where Kirby drew the background characters only, and the cover of AVENGERS #35, where the Captain America figure is lifted from a TALES OF SUSPENSE story.
Also, just for completeness, the recent AVENGERS #503 apparently reprints three pages from AVENGERS #16, as well as a few Kirby panels in some collage pages of Avengers history. No comment on the rest of the book, except to say there are far better ways to get those Kirby pages.