The Reigns vs Rollins and Cena vs Styles matches were the same ones that were planned when they initially decided to do the roster split. Cena Styles being for the new Smackdown title, and Reign vs Rollins for the Raw title.
Plans have changed, but that doesn't always mean they'll end up different from this.
The most annoying thing about this year is that it was meant to be a summer of Bray. He was meant to go into the title picture and face Lesnar. But then he got a fluke injury, Lesnar did UFC, and now we're splitting the rosters. So that plan is totally down the drain. Hopefully he'll get his push once everything has sorted it's self out again.