I have heard some talk about Region 5-5A. I don't know about Region 6 and 7. it will be interesting to see what happens there.
Region 5
Page, Nolensville, possibly Centennial, Columbia Central, Lawrence County, Lincoln County, Tullahoma, Franklin County.
Region 5 loses Shelbyville (6A) ,and Spring Hill (4A), and picks up from 6-5A Page, Nolensville, and Centennial.
All just speculation at this point, who knows what the TSSAA will do. There are so many 5-A schools in the Nashville Metro area it will be interesting to see how these schools are divided up.