If the area you are asking about is Sierra Montana, I would tell you - it is probably an empty lot cause the builder stopped building cause the market collasped. If the builder is still in business, Beazer and Richmond America for example, they had stopped building out there and may start up again. These is true out in Cortessa and will probably happen in Northwest Surprise too. Your realtor, if you are interested in a new build - can usually just put a phone call into the builder/developer to get new build info for you as to what they are planning for that area. Of course, there are several already completed homes in that area that are worth looking at, instead of having to build from scratch - hence your initial inquiry I am sure.
If that is the case, just remember - empty lots next to your house bring snakes and scorpions. Good pest control and weed control spraying will be critical until that builder gets a new house built to keep those critters away from your house. :-)