So he is meeting with Mizzou officials in Florida where he is vacationing. They seem to say Painter is the leading candidate.
http://sports.espn.go.com/ncb/news/story?id=6268809
I am not completely convinced he would leave Purdue for Mizzou. That would seem to be a lateral move, but maybe he doesn't think Purdue is committed or doesn't get along with someone at the University. But at this point everything is still speculation.