I highly doubt we see Exum play college ball. A few months ago, he said he was 90/10 in favor of playing at a U.S. college. Recently, he's lowered that to 50/50. And now Chad Ford and co. are calling him a top three pick in next year's talented draft. The way this is trending, hard to imagine not heading directly to the NBA.
I've heard some scuttlebutt about him coming over in January. Apparently, he receives his high school diploma this winter and has considered the possibility of joining a program at that juncture. Not sure how that benefits any party involved, but it's been bandied about.