Apple is testing multiple next-generation iPhones, and at least one of these devices sports a brand new display, a report in 9to5mac.com says.

These prototype phones are floating around Apple HQ in thick, locked shells in order to disguise the exterior design to “undisclosed” employees. The phones are in the PreEVT stage of development and are codenamed N41AP (5,1) and N42AP (5,2). Because Apple reserves certain models for internal-only usage, the report says

Both of these phones sport a new, larger display that is 3.95 inches diagonally. Apple will not just increase the size of the display and leave the current resolution, but will actually be adding pixels to the display. The new iPhone display resolution will be 640 x 1136. That’s an extra 176 pixels longer of a display. The screen will be the same 1.94 inches wide, but will grow to 3.45 inches tall. This new resolution is very close to a 16:9 screen ratio, so this means that 16:9 videos can play full screen at their native aspect ratio, it says.

Besides, Apple will be taking full advantage of their new pixels. Apple is currently testing builds of iOS 6 that are custom-built to the new iPhone’s display. These builds include a tweaked home screen with a fifth row of icons (besides the stationary app dock) and extended application user interfaces that offer views of more content. Apple is able to pull this off with the same sharpness as the current iPhone Retina Display because of the additional pixels.

In terms of hardware other than the new display, both of these prototypes definitely include a home button and the previously-rumored smaller dock connector. Apple will be bringing these dock connectors to all of their iOS devices over time, and it is not exactly a “pill-shape” as rumored. It’s basically a much narrower version of the current squared off (on the corners) dock connector. It is between the size of a Micro-USB and Mini-USB connector, 9to5mac says.