Concerning the Estrada "display", wikipedia quotes Marc Dillon:

• 4.5” Estrade display, described as "HD" (precise resolution not yet announced)

Marc Dillon explains - "(the) “Estrada” is actually our own term. It’s basically this combination of the user experience. We have this long and vertical experience that’s very easy to access where you have your lock screen at the top, which shows you notifications, you scroll down a bit and you get your applications, then you scroll down a bit and you have your home screen with your multi-tasking capabilities. Scroll a bit more and you have applications, and at the bottom of that you have your applications store. The Estrade display is this combination and we’ve made it one part of your user experience, as a vertical, that allows you to access different kinds of things very quickly.