They are aiming for 6600 again. The site must have been updated with actual rate detail:
Of the 55,500 applications UM received for the fall of 2016, 10,959 were submitted by in-state students with 4,511 being offered admissions for an acceptance rate of 42.4 percent.
From among the 35,783 applications submitted by students living in states other than Michigan and the 8,758 applicants living in other countries, 10,815 were offered admission for an out-of-state acceptance rate of 24.5 percent.