@failures art,
A lot of people have been making the mistake of thinking Mubarak has no choices or is a puppet of the military leadership.
He is pissed off and he's one very tough bastard: you don't run a country for 30 years and survive six assassination attempts if you're not.
Obviously he's cut from different cloth than his Tunisian counterpart. His primary concern is not to spend what's left of his life in a resort somewhere outside of Egypt; enjoying the riches he stole from his nations treasury.
I'm pretty sure he thinks the demonstrators are a minority of ingrates who don't appreciate all (he thinks) he has done for Egypt, and he, apparently, thinks he still has the clout to put them in their places.
Maybe he does.
The news that he was leaving hit the airwaves damned early and so, obviously, someone in the Egyptian military was leaking what he thought would happen. Maybe he didn't check with Hosni.
If this is Mubarak's last hurrah and the military is calling the shots, he'll be on a plane out of Egypt tomorrow to seek medical attention in Germany or the US.
If he still has a viable power base, anything could happen and it all is probably going to bad.