John Sickels has his updated Mock Draft for June available, and says:
One of the few firm rumors (is "firm rumor" a contradiction in terms?) going around currently is that the Astros are leaning in the direction of a college player, since it will take them less time to reach the majors and none of the high schoolers have truly elevated themselves over the college crop.
Sickels' choice: RHP Kevin Gausman, LSU