Mike Guentzel was interviewed on KFAN sports radio in the Twin Cities about his decision to resign. Technically, you can listen to it here, but I'd be irresponsible if I recommended you listen to anything from that "sports talk" station.
I'm not sure what Guentzel's next move will be, but I'm sure he'll back in coaching somewhere. As far as his replacement, the name was passed along to me as a very likely candidate was St. Cloud assistant coach Eric Rud. Rud played for Don Lucia at Colorado College in the mid-90's, and if he was interested in the job, it would probably be hard to find a better choice for the job.