Opteryx has released his Nevada Terrain Island in the BIS Forums and a video.
Right, now I started this 3 days ago and I just want to stress that this is FAR from complete, you could consider it an open alpha release.
At this stage the map contains nothing, no roads, objects or anything, just some basic clutter so don't expect it to be anything amazing. Also the detail textures, satellite texture and mask needs quite a lot of work. The terrain data is completely unedited, this is identical to the DEM data, only difference is that I had to reduce the total elevation by a 1000 meter due to helicopters being unable to fly at this height above sea-level. Now remember, this is still at a very early development state, so don't complain about it lacking in content.