Reports on Scout and Rivals have stated that Devin Gardner will announce his commitment on this coming Monday. The overwhelming sentiment on these sites and other message boards is that Gardner will be a Wolverine.
UPDATE: Ah, the fickle minds of youth. According to Rivals.com, Gardner will not hold a press conference on Monday to announce his decision, but he will decide on Saturday. Since he is scheduled to attend Michigan's spring practice on that day, that bodes well for the Wolverines.