I just got back from Cairo last month (was a lifelong dream that I finally lived out - got engaged in front of the Pyramids too!) and if you plan on going to the Pyramids, that is far enough away from Central Cairo that any plans shouldn't be affected. In fact, if you go and want to stay at one of the best places to see the Pyramids, stay at the Sphinx Guest House. It is directly ACROSS THE STREET from the Pyramids and they have a rooftop you can go up to and just drink tea and stare in amazement.

From what I've been reading, things are better there now...so even going into Central Cairo shouldn't be too much of a problem. It was just during the protests that things were a bit dicey.

If you need any information, just let me know! I can send you trip photos and an itinerary that we used for trip ideas you may want.

I would go ahead and book the flight, but maybe get trip insurance to keep your option open to back out in the event something over there flares up again.