As revealed on EW.com (with follow-up and details on StarWars.com), the Solo publishing program is not different than any other film. There are adult and children's fiction, comics and behind-the-scenes titles.

Last Shot (Del Rey), Daniel José Older
The author of Half-Resurrection Blues and Shadowshaper has penned this novel that connects three eras in the lives of Han Solo and Lando Calrissian. “Part of it takes place before the events of Solo and focuses on Lando and L3-37,” Siglain says, referring to Lando’s droid sidekick in the new film. “Part of it takes place between Solo and A New Hope, and that focuses on Han and Chewie, and that’s where we get Sana Starros for the first time.” She would be the character, first introduced in the Marvel Comics, who claimed to be married to Han.

“Part of it takes place post-Return of the Jedi, and that’s where we see Han, Leia, a very young Ben Solo, and Lando come into the story,” Siglain adds. The cover is reversible — on one side is Han's silhouette, while Lando’s is on the other. There’s also a “convention exclusive” cover featuring L3 and Chewbacca …

“We bounce around through time,” Siglain says. “We always wanted to tell a story that had Han and Lando having one adventure after Return of the Jedi. At the same time, we really liked the idea of contrasting that with seeing them much earlier in their lives. A crime lord comes looking for the owner of the Millennium Falcon, but mistakenly thinks it was Han Solo at the time, but it was really Lando — which gets Lando mixed up in something else Han did that was Han’s fault. All these years later, the two of them have to right a wrong from much earlier in their history.”

Most Wanted (Disney Publishing), Rae Carson
This YA book by the author of The Girl of Fire and Thorns focuses on Alden Ehrenreich’s Han Solo and Emilia Clarke’s Qi’ra, back in their teenage years. “This is about the younger, young Han solo,” Siglain says. “We’ll see what it was like for these two kids from Corellia to survive the seedy streets of this industrial world. They’re definitely products of their environment, and this story shows that.”

Lando: Double or Nothing (Marvel Comics), Rodney Barnes
This Marvel Comics miniseries is written by Rodney Barnes (a veteran scribe from TV’s The Boondocks) and will play out over five issues. “It’s focused on Lando set during an incident right before the film, with backstory about Lando and L3,” Siglain says. The series debuts the Wednesday after the movie opens, since its story is so closely tied in. “Coming out of the film, we think everyone is going to want ot read more about Lando.”

More titles can be found at the links above.