Usually the first details don't come out until a week or so after the draft. Around draft time, they usually just tweet out pictures of the rookies with their new team.
Among all of the things I'd love to see in Madden 15 would be a slow down on the progression of linemen. I'm in year three of my offline CC and there's maybe four or five teams who don't have an 80 or above at every position on the line. Though to be honest I wish EA would get rid of overalls period.