SMD [Samsung Mobile Display] is planning to release a 4.6” Super AMOLED HD Plus with the 319 ppi for the Galaxy S3 Super AMOLED plus in May of this year. In addition, SMD is expected to add phosphorescent green, which will reduce power consumption and make the OLED display competitive with the retina display at white levels of 40%, while significantly outperforming LCDs for images and video.
The Plus means this screen will not be using a Pentile pixel matrix. That’s good news since a Pentile display shares the red and blue pixels on the green cell, rather than having three separate cells, making the display nearly 30% less sharp, technically, than a full dot matrix screen. Normal users won’t notice a difference, but many screen enthusiasts (screenophiles?) claim they can, and won’t buy a device with a Pentile display.
This report also mentions a May release, which seems perfectly plausible, but we have no other evidence to confirm this date.