It's no big secret that Our Glorious Leader has very particular tastes, and he likes getting his way. Fast cars (Mercedes Benz), fast jets (Gulfstream), and according to Valleywag
, secret three-legged stools. Though no real details are known about said stool, the Valleywag tipster says that Unkie Steve requires his designer stool to be present at all important meetings (both Apple internal meetings and certain outside meetings), as well as available to sit on during long flights on his jet (though the safety of a three-legged stool in turbulence seems dubious to me). One would imagine that this stool will be present during the keynote, so everyone keep their eyes sharp to see if we can't identify it.