Pip-Boy 3000 Mark IV

The Unnamed Pip-Boy is an item in Fallout 4.

Reveal
In the third of June Fallout 4 announcement, Bethesda showed off a new model of the iconic Pip-Boy that would be used in the game. The new Pib-Boy features several time during the reveal trailer, but is most clearly seen when the Vault 111 resident stoops to pet his dog.

Characteristics
The new Pip-Boy features a number of similarities and differences between previous models. Particularly the Pip-Boy 3000.

Similarities to Pip-Boy 3000
The new Pip-Boy, like the 3000, is worn on the arm. It features a cylindrical metal case with a large, curved display in the centre. Like the 3000 of Fallout 3, the display appears to be of a green colour. The device features a number of rustic dials, a number of buttons below the display that may be used for "mode selection" (similar to the "Stats", "Items" and "Data" buttons of the Pip-Boy 3000). Also featured is what appears to be a Radiation Guide and an ambient-orange light.

Differences
There are several major changes to the layout of the device. The majority of the settings dials appear to have been moved to the right of the device so that it can be used easily when worn on the left arm. The new model features 2 side mounted dials, as opposed the a large "scroll wheel" used in the 3000. The dials used in the new model also resemble cogs, as opposed to the "rocket glider" design used in the the 3000. Also, the secondary dial (used to navigate between settings such as "world map" and "local map" appears to have more that the 5 settings used in Fallout 3. The "mode selection" buttons are also made of thin chrome strips, as opposed to bright orange buttons.

Also of note is the addition of a fourth "mode selection" button. It is unclear as to what this button could do, but it is certainly prevalent.