Give me one, now. Sharp have begun the production of 5-inch 1920x1080 displays at their factories - the joy! At 5-inch and 1080p, we're looking at 443 pixels per inch (ppi).
Considering the iPhone 5 only sports 326ppi - this is going to be a huge thing for new smartphones sporting the seriously packed 5-inch displays. We could also be staring down the barrel of 5-inch tablets with 443ppi displays, such as a smaller Nexus tablet to compete with the impending release of Apple's iPad mini.
Then we'll have the worry of "will people be able to see the quality in these screens" at this size, and resolution? If you've ever looked at an iPhone 5 and a third-gen iPad, you'll know that quality trumps. I think we'll begin to see some very beautiful looking smart devices with these 426ppi displays.