iPhone 8/Edition might not have curved edges.
I am very sure that you can get a bezelless design without having curved edges. I think the reason for this change in rumours is the availability of the curved edge screen. By keeping the screen flat they'll be able to keep up with production demands. I think the predictions for a year or two later release for curved screen are more accurate. It's not good for Apple to compete w/ Samsung for its own displays. This doesn't look good on Apple's brand, who should be known for being independent from a shaky Samsung reputation. Apple won't need OLED screens from Samsung if they don't go curved.