In February 2019 Samsung Display started to mass produce its new 15.6" 3840x2160 OLED display panels, and some of the first 2019 OLED laptops are already shipping.
Korea-site The Elec says that according to its sources, Apple is "considering adoption" of OLED displays in its Pro laptop and tablets lines. The iPad Pro will adopt an 11" OLED while the MacBook Pro will adopt a 15.6" one.
Many reporters say that these are just rumors - but even if true, they just say that Apple is considering a switch to OLED displays. But it is indeed highly likely that Apple is testing SDC's new larger AMOLED displays - including the new 15.6" ones, so this in actuality is hardly real news.