According to ESPN Insider Chad Ford, it's no longer a guarantee that Miller even goes in the first round:
Quincy Miller, F, Baylor Bears
Considering that most GMs believe Miller would be a top-10 pick in the 2013 draft, it seems odd that he could slip entirely out of the first round. But that's looking more and more like a possibility. The talent is there, but concerns about his ACL and his position continue to haunt him. The medical reports from Chicago are starting to trickle in, and it looks like they aren't putting teams' concerns to rest.
If it's an issue of medical liability, than Miller very well could slip into the second round, where contracts are no longer guaranteed. The same thing happened to Dejuan Blair in 2009, when he went from a mid first-round pick to an early second-rounder when it came out that he didn't have an ACL in either knee.