Looking at the live pictures from Tahrir Square it seems that there are more people there than yesterday.
The army has build concrete block barricades into many access roads to the square. They may be intended to stop or at least hinder the big demonstration the opposition has announced for tomorrow. A pro-regime demonstration has also been announced though it is not clear yet if the plan is to have both demonstration meet and fight it out.
Mubarak promoted some additional hardliners to cabinet positions. He clearly does not want to give up.
The international community, aka the U.S. and EU, now have a new incentive to push Mubarak out. Brent oil just broke the 100$/barrel mark. Oil prices over $100 usually pushes the U.S. economy into a recession. Obama certainly does not want or need another one.
Insecurity about Egypt and the Suez Channel demands that the world pays a high risk premium – or change the situation.
From Wikileaks cables we know that the U.S. "Leahy vetted" what seems to be every officer in the Egyptian Army. We can thereby be sure that the Pentagon has quite intimate knowledge about and good connections with, not only to the very top officers of Mubarak's army, but also to the Colonel and One-Star General level.
Some phone calls made, some money transfer arranged and a coup scenario suddenly becomes a real possibility. Brent at $100 makes it a necessity.