Just a few days ago badassdigest broke the story that Star Wars: Episode VII starts filming on May 14 in Morocco. Now THR adds some more bits to the rumor and make it even more credible...
Sources tell THR that J.J. Abrams and Disney are planning an extensive re-creation of the desolate home of Luke and Anakin Skywalker in a Morocco-like environment (the original was built in Tunisia).
If the Morocco filming rumor is true then probably the Cairo - Abu Dhabi rumor isn't. I don't see a reason for them to go to three different dessert like destinations, but who knows maybe they'll use only plate shots from Cairo and Abu Dhabi.