Protoss Interplanetary Ship
Was browsing through the doodad files in HOTS and found this ship model attached to the hologram displays in the ship, I edited out the display stuff, and the only texture that exists that I know of is the hologram one, so it is going untextured.
This ship is the one you are aboard for the Enemy Within mission in HOTS.
As all the doodads were just posted as well, if you want to find it in the files, it is a HOTS doodad this is something like Ship Display. Obviously blizzard owns all rights to this model.