While the situation remains fluid, and the US state department remains in the dark as far as it wants the public to know, Reuters is reporting [4] that Egypt's state news agency MENA states "Egypt's leading Muslim and Christian clerics and the leader of the liberal opposition alliance Mohamed ElBaradei will jointly present a roadmap for a political transition shortly." Of course, use of the word 'coup' is expressly forbidden but as @RichardEngel asks (rhetorically), "Is it a coup if the people ask for the military's help? The brotherhood clearly thinks it is."
It appears like the liberal opposition leader ElBaradei (infamous for his disagreement with the US over WMDs in Iraq [5]) will assume some leadership role.
Via Reuters [4],
Egypt's leading Muslim and Christian clerics and the leader of the liberal opposition alliance Mohamed ElBaradei will jointly present a roadmap for a political transition shortly, state news agency MENA said on Wednesday.
The announcement follows talks with military chiefs who gave President Mohamed Mursi an ultimatum to share power, which has now expired. The generals would be present at the announcement along with members of the Tamarud youth protest movement, MENA said.
The clerics would be the Grand Sheikh of Cairo's Al-Azhar institution, a leading authority in the Muslim world, and Pope Tawadros, the head of the Coptic Church and leader of Egypt's millions of Christians.