Here is what I know of that should be part of the upcoming schedule next season:
HOME
Cincinnati
Missouri
AWAY
TCU (Big East/Big 12 Challenge)
Wake Forest (Skip Prosser Classic)
NEUTRAL
3 games in the Charleston Classic (field includes UConn, Florida, Miami, Saint Joe's, Missouri State, Buffalo* and Towson)
We should also find out in April or May as to who opponents would be for the Gavitt Games (Big 10 foe) and the inaugural 2019-20 Big East/Big XII Challenge. That's likely going to leave room for 5 buy games at Cintas next season.
*UPDATE: Buffalo is also replacing Penn State in the Charleston Classic. However, their top 3 scorers are graduating from their team that advanced to the 2nd round of the NCAAs.