I think Detroit will get a "summer" or "fall 2018" rather than a hard release date so they still have a couple months window to operate in. I would say Days Gone gets a "fall 2018" too but that's more of a PSX probability since it's (hopefully) the only chance it's at a PSX.
My prediction is that Sony will try to have something once a month or every 30 days, including games it has marketing deals with in 2018. They will try to treat Spider-Man like a summer movie blockbuster.
Ni No Kuni 2: 1/19/18
Monster Unter Worls: 1/26/18
God Of War: late Feb 2018
Yakuza 6: March 2018
EDI: Red Dead: March/April 2018
MLB The Show: March/April 2018
Shadow Of The Colossus: May/June 2018
Spider-Man: June/July 2018
Detroit: August 2018
Days Gone: Sept 2018
Fall/Winter will be the usual games they have marketing rights on, Destiny expansion, COD, maybe Star Wars EA game.
Edit: They have the marketing rights for Red Dead so I think that comes out in March/April with God of War coming out 30-40 days before that.