As we talked about earlier this year (here, here and here), the FAA has shutdown US airspace to all commercial drones that don't have specific authorization from the FAA. The FAA is working on a approval process that commercial drones (real estate photography) will have to go through to fly in the future. Hobbyists flying drones are not restricted. This process will take about three years (by Sept 30, 2015) to complete.
I noticed a link to this article on EFF.org recently on HuffingtonPost. This article had two things that were new to me:
As the article says, there are many questions that are unanswered so things are far from being clear. Bottom line is don't bother investing in drone gear to do your aerial real estate photography, you risk being busted buy the FAA, paying a serious fine and perhaps serving a jail sentence.