In my local area, there is a local baseball discussion forum. One thread noted several months ago that an area player had committed to "a big, public, state university". Six months later another thread notes that the player has withdrawn his verbal.
Player was a recruited walk-on. After the verbal commit, things got quiet. No response to calls, texts or emails to the coaching staff. They finally responded back that they had just forgot to contact him. Basically, by not responding they painted a clear picture that they didn't want him anymore. Apparently this school routinely over recruits and if they find a better prospect, they shun some of their early verbals to the point they back out. This school has had a very successful season.
Don't know anything other than what I read on another board. The player in question has since been drafted.