Forwarded this along and asked some folks if they had heard anything or what they thought. Here are some responses for what that may be worth to you:
"The Konerko-Goldschmidt talks popped up two years ago, and the D-Backs said no. Why would they do this now? "
"I'm not 100 percent sure on this, but I think the Diamondbacks got rid of Callaspo about five years ago after he roughed up his wife."