I was going to update when the practice session times were in, but since Millennium dropped out I figure I'd change my predictions in case I forgot.
LMP1:
Q: #20 Porsche Team
R: #2 Audi Sport Team Joest
LMP2:
Q: #26 G-Drive Racing
R: #26 G-Drive Racing
GTE-Pro:
Q: #92 Porsche Team Manthey
R: #97 Aston Martin Racing
GTE-Am:
Q: #75 Prospeed Competition
R: #61 AF Corse