I'm sure I'm not alone in feeling 'prequel-fatigue' but I think all of these "the story behind [famous movie character/event]" kind of movies are getting really predictable. Some recent examples include Victor Frankenstein, Oz the Great and Powerful, Pan, Dracula Untold, The Hobbit and even Rogue One. At this point, I feel like I've already seen the young Han Solo movie because it will basically just connect the dots of events we already know about. My predictions:
Han Solo is a down-on-his-luck space orphan who is taken in by Woody Harrelson and taught the ways of being a smuggler and all around scoundrel. Somebody mentions the Force and Woody is like "don't you go believing that mumbo jumbo, kid." Cut to a few years later, a young adult Han wakes up in some girl's bed and leaves in a rush, being late for a job. Well, the job goes bad and Woody Harrelson dies. With his final words, he gives Han his blaster and "lucky vest."
Han takes over the smuggling business and eventually finds himself in a card game that includes young Lando, who is forced to bet his ship to stay in the game. Han wins by bluffing and Lando takes him outside to show him his new ship... the Millenium Falcon. Lando is like, "She takes two to fly properly." And Han says something like, "Looks like I'll need to find a co-pilot. You interested?" Lando joins Han as a temporary co-pilot. "Just one more job." "It's always just one more job."
Despite hating the Empire, they need the work and upon delivering some Imperial supplies they see a bunch of wookies being taken captive. They rescue them and Chewbacca pledges a life debt to Han and joins the crew of the Millennium Falcon. Avoiding the Empire as they are now wanted men, they start taking more and more smuggling jobs, including dropping off a crate of supplies on Dagobah and Han saying "who would want to live in a place like this?" They fly by Bespin and Lando is like "Sure would be nice to run a place like that one day." And Han is like "Yeah, keep dreaming, pal." They swing by Alderaan so we can see Jimmy Smits with Artoo and Threepio and mention a delivery "for some princess." Bascially a parade of obligatory cameos from recognizable characters. Maybe we can cram Darth Vader in there again somewhere, or catch a glimpse of Forest Whitaker.
Eventually, Han takes a job for notorious gangster Jabba the Hutt. Lando is like, "I've got a bad feeling about this." Han gets cocky and careless and is discovered by the Empire. Ditches the cargo which belonged to Jabba. Now there's a price on his head. Lando quits the business. "Take care of yourself, Han." Reference to not wanting to be thrown in a Sarlacc pit. Chewbacca honors his life debt and becomes Han's co-pilot.
Jabba hires the deadliest bounty hunt in the galaxy to capture Han...Boba Fett. In an action-chase sequence, Fett almost gets him but at the last minute Han is saved by Chewbacca. Then Han is like "Okay, pal, looks like we're even. I don't blame you if you want to take off." And Chewie is like "RRRAAAAUUUGHHH" and Han is like "Okay but how are we going to pay off Jabba?" and Chewie roars again and Han says, "A race? What kind of race?"
They enter into some races to make some extra money. Avoiding detection from the Empire AND bounty hunters is no easy task but with the Millenium Falcon, against all odds, they make the Kessel Run in less than 12 Parsecs. They win the money to pay off Jabba so they head back to Tatooine. Before they go to Jabba's palace, they stop by Mos Eisley for a drink. Chewie says some old man will pay handsomely for a ride to Alderaan...