The Kick-Ass writer and Watchmen artist's collaboration was first mentioned in November last year.
The title has received a teaser in Millar and Leinil Yu's Superior #6, which is released today.
"In 1987, schoolboy Mark Millar asked Dave Gibbons to draw one of his stories," reads the teaser.
"In 2012, that dream came true."
"We don't want to give too much away at this stage," Millar told Comic Book Resources.
"We've got a charity auction to name the super-villain going live later today, but otherwise you won't hear anything else about The Secret Service until the middle of November when CLiNT #12 has a massive interview and preview of the series."
The title of the comic, which will be published under Marvel Comics' creator-owned Icon imprint, had not be revealed before due to legal issues.
CLiNT is a Millar-edited anthology comic that has debuted some of his new projects.
Millar is also working on a forthcoming superhero project with Frank Quitely and Supercrooks with Yu.