No rumor at all has claimed OLED this year and the ramp goes with or without Apple.
Samsung has competitive costs for OLED and Everdisplay is doing ok too, curved is starting to be addopted by other phone makers and at some point there will be foldable.
The interesting questions are, will it be PenTile or RGB. flat or curved. It could even be too late for Apple if others are 1-2 years ahead. Samsung failed to take advantage of curved by not absorbing the extra costs, others might not make the same mistake.