The US Travel Warning for Egypt has been downgraded since yesterday and now includes a new paragraph relating to Luxor and other areas as follows:
“The security situation in most tourist centers, including Luxor, Aswan, the Luxor-Aswan Nile cruise routes, and Red Sea/Southern and Western Sinai resorts such as Hurghada, Sharm el Sheikh, Dahhab, Nuweiba, and Taba has been calm; U.S. citizens should remain alert to local security developments.”
The previous travel alert had advised US citizens to avoid all but essential travel to Egypt.
You can read the complete contents of the new Travel Alert for Egypt here