Not to nit pick, but Utah is actually East of Nevada. It is however, in more of a North easterly direction from Vegas. http://geology.com/world/the-united-states-of-america-map.gif

More on topic though; While I am glad to see something, I think it is kind of hard to tell much of anything with any certainty from the shots I've seen

Yah you're right. Next time I should google map it. So the northern passage wouldn't make to much sense then. Anything in the north east end that's an entrance? I can only think of the train tracks from Boomers but I think that's a back entrance into the Boomers.

There's a train tunnel near nipton that's closed off.

Looks awesome. Also looks like this will focus a lot on energy weapons which is awesome. I thought that one screenshot was The Pitt at first.