This is a surprisingly long article, but here's the gist of it: switching to flat-seamed balls will reduce drag and allow the ball to travel farther when hit. The NCAA is looking to improve offensive output, especially considering last year's College World Series only saw 3 homers and the fewest runs scored (86) in CWS history dating back to 1950.
NCAA To Switch To Flat-Seamed Balls In 2015
NCAA To Switch To Flat-Seamed Balls In 2015