I spent the last two odd hours hanging out on macrumors.com's live blog news feed of this event, they rock. What follows is what I learned from the event. (thanks to macrumors.com for doing this coverage you guys are top notch!)
iPad PRO
. Screen size is the size of the air 2's screen + bezel
. 2732x2048 resolution
. a9x processor
. 4:3 ratio
. 10hr battery life
. four speakers, ipad adjusts volume source based on how device is held
. 1.57lbs (.03 heavier than original ipad)
. .9mm thicker than air
. processor self throttles back based on your activities to extend battery life