K12 Imagineers: A glorious four minutes. That was the length of the "graduation speech" each of ten startups got to give before 100 or so potential investors at the Demo day for Imagine K12's first cohort. EdSurge heard good buzz from investors who listened to the presentations. Even so, Imagine K12 cofounders cautioned their entrepreneurs that this was just the beginning of their funding steeplechase. The ten present again this Wednesday morning (9:30 am PT) at TechCrunch's Disrupt SF. Watch 'em here. Cheat sheet below. Beta alert! All of these companies are rocking into beta.