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A supposed Samsung roadmap was "leaked" on the internet and it suggests that Samsung's next generation smartphone, the Samsung Galaxy S IV, will pack a 5" high quality 440ppi display (the iphone retina display is around 330PPI).
Digitimes, a Taiwanese component and rumor paper, says they will use hexagon and diamond shaped pixel layouts to achieve this incredible density. It is also believed the device will be powered by an 8-core 1.8GHZ Exynos 5 Octa processor, 4G LTE, 2GB RAM, MicroSD slot, wireless charging and a13 megapixel rear camera.
Most rumor sites are claiming a March/April announcement for this wonder-phone.