From Ask BA
Basically speaking, here are the high school names who might fall due to signability concerns with their reasons in parentheses.
1B Eric Hosmer (Boras client)
RHP Gerrit Cole (Boras client)
RHP Alex Meyer (Boras client)
LHP Nick Maronde (Boras client)
LHP Brett Mooneyham (Boras client)
RHP/SS Casey Kelly (Commitment to play QB at Tennessee)
OF Xavier Avery (Commitment to play RB at UGA)
RHP Sonny Gray (Vanderbilt commitment, fractured ankle likely to drop him out of the 1st round)
LHP Dan Hultzen (Strong UVA commitment)
LHP Kyle Lobstein (Signing demands)
LHP TJ House (Signing demands)
RHP Brett Marshall (Signing demands)
RHP Austin Dicharry (Signing demands)
For more information on each prospect, read the article.