The Reds schedule is usually a good barometer of what the start of the season will look like for the Bengals since they don't schedule home games that coincide with Reds home games at the same time. Reds are on the road Week 1 & 2 and home for Week 3.
So there is a solid chance that the Bengals will start with two home games and potentially 3 of the first 4 at home.