As days are passing away technology is further developing, today Samsung said that they will start developing 1080p Super AMOLED Display with 400 ppi Pixel Density in 2013. Currently HTC (HTC J Butterfly), Sony, LG as well as Chinese manufacturer Oppo are developing or developed these new 1080p AMOLED Displays.
Samsung has recently launched Nexus 10 which packs an Ultra HD display with resolution of 2560 x 1600. According to GSMArena these displays will be atleast of 5 inches of size. The rumor mills are now abuzz with talks of Samsung getting ready to develop Full HD display panels for use in its smartphones. As said above HTC has developed this type of display but they use Full HD LCD panels and Samsung want to us its own proprietary AMOLED technology.
So we need to wait and than to see the result next year.