Michigan will get two major pieces of their secondary back for next year as Lavert Hill and Josh Metellus have both announced that they'll forgo the NFL draft on social media. Hill was 8th on Kiper's CB board and would likely have been a second or third round pick; Metellus was a bit fringier as a prospect but is probably draftable.
Hill's return in particular is important for Michigan's secondary next year. Ambry Thomas is a highly touted guy entering his third year and should ascend a starting job. Now Hill will bookend him instead of a redshirt or true freshman.
Devin Bush and Rashan Gary have announced they're entering the draft; Shea Patterson and Ben Bredeson will return. David Long and Zach Gentry are still potential NFL departures. I'd been banking on four departures when ballparking the size of this class, but I also wasn't expecting a couple of the departures Michigan has suffered, so I'd guess Michigan has a couple spots they could fill in the February signing period.