Unnamed Pip-boy - Removed Example Edit
A new Pip-boy which has been removed can be seen on the promotional graphic/ wallpaper ( http://content.bethsoft.com/bsw_cms_asset/47158_2_0.jpg ). It is to the left of the suspended power armor on a workbench; above the scrapped Mister and to the left of the red stool.
Although quite small it is possible to discern the features of the new Pip-boy. There appears to a small illuminated panel on the top (yellow light) though this could be an object behind it.
It appears to be further confirmation that Pip-boys can be removed as noted elsewhere;
Despite Stanley saying in Fallout 3 that Pip-Boys cannot be removed, at the start of Fallout: New Vegas Doc Mitchell gives the Courier his old one (meaning he must have had it removed).
In the promotional graphic it is removed but in the Fallout 4 - Official Trailer, the Vault 111 resident is wearing one. It could be the same Pip-boy or a spare. Note that he is carrying the same rifle which is still resting against the chair at the end of the building, so it tends to suggest it is a spare.
There is a NPC version of the Pip Boy mark IV.
It's worn by residents of Vault 81
the ID is 1B9B87