No deaths in our party of 5 (the included pregens with the errors corrected). Since we knew we were going out that day with the express purpose of KILL IRONTOOTH (although we didn't know exactly how rough that fight would be), we arrived at the Irontooth fight with all of our daily powers available, and many of the characters had an action point available. I don't recall if anyone was knocked down into death saves, but it would have been no more than one character. It did feel close, though - by the end of the fight, we had used all our daily powers, all our healing powers, and all of us were bloodied, with 4 of the five having single-digit HPs left.
A great time was had by all... except maybe the kobolds. As the dwarven fighter, I went in with Irontooth's name written in goblin on one face of my maul. I'd show that side to the kobolds, and then if (when) hostilities began, flip it around and start bashing with the unmarked side. It was a great joy when Irontooth finally showed himself and I got to put the side with his name on it to use.