According to Xbox Wire, Star Wars Battlefront II will have two-player offline split-screen, but only on consoles. The site states..
“Exclusive to the console version of Star Wars Battlefront II will be two-player offline split-screen co-op. Get ready to team up with your friends from the comfort of your couch as the two of you battle across the Star Wars universe. In this mode, you’ll be able to earn customization rewards and bring those upgrades with you to the online multiplayer battleground.”
Despite coming from Xbox Wire, the same feature will also be included on the Playstation 4 version of the game.