I also think that the D4 teams play 2 games against the D3. I thought Mike posted this somewhere but was not able to find his post. His logic was to give the D4 and D3 teams and idea of what to expect as they advanced.
Yes it is back to a two day event. Friday would of been super slow and there is no reason for people to miss work or school if it's not mandatory. The fields will still be open to walk all day Friday and even on Thursday if you want.