I have been waiting for Apple to release a successor to MB12 but it does not look promising in the near future. Moreover, I am a big fan of OLED screens and had OLED tvs and Iphones for a while, with perfect blacks and great contrast. Turns out, HP has an ultrportable with 13.3 in OLED screen, Spectre 360. I have not seen other manufacturer using this size OLED panel, seems to be sourced from limited production run by Samsung. While this laptop has a fan and heavier than MB12, I am thinking about rolling the dice on it to see if an OLED laptop would be the upgrade I was waiting for. 4k OLED screen in a small package should be great for extensive reading and reviewing images that I do for work, I just hope that panel will be uniform.
Samsung have had 12" Tab Pro S 2016 and later the Book with 10" and 12" SAmoled displays in 2018
The newer 15" 4K panels found on premium devices are usually Samsung panels
The burn in remarks tend to be somewhat over stated even Dave2D did an extreme test with no issues
The biggest problem is more to do with the color accuracy when calibrated tends to be best at high brightness levels >400 nits.
Currently 60hz is the max refresh but response time is ridiculously fast. But OLED are pushed on the $3-4K creators platform so can't be all bad
If you can afford the option OLED is a joy to view but not so good for AAA games currently where 120hz or greater is preferred
I would not be overly concerned and we are all aware of the infamous de-laminating screen coatings Apple put out for years on so called premium products. We had 2 go wrong.
I would not hold my breath for a 12" MB refresh with OLED even though I would be tempted having owned 2 and my wifes 2015 is just on it's last legs.
Lets face it how long the old MBA had their screens I had bought 6 of them and finally said no more with that lagging screen resolution. So don't expect anything that soon.