The tavern does appear in-game actually, its the tavern in whiterun. They just moved some furniture around in the final release, but you can tell its the same place because the stuff behind the bar is in the exact same layout and the screenshot.
Its actually the exact same
this is from E3
http://i.imgur.com/u5Lky0B.png
http://i.imgur.com/nLGKbkn.png
http://i.imgur.com/xdWfyTk.png
Whereas this is from the initial reveal trailer
http://i.imgur.com/K0SVJ29.png
http://i.imgur.com/4VzJi9V.png
http://i.imgur.com/ieqizgu.png
Its the same, from the side table near the back door, to the kitchen area, to the dining room, to the side table behind the dining room table, its exactly the same. The only thing that's different is some clutter items, but the layout is exactly the same. Even the hallway to the bedrooms is the same, with the same hall closet, the same restroom(which the Mr. Handy box is sitting in), and the same location of the baby's room.