If you want some info on area C, here's some helpful things
All Bands in 4A Area C and their region results for the past 3 years
I would expect all of the bands who've had 1s for 3 years now to keep getting them, and bands who've mostly gotten 2s to keep getting 2s, but there are a select few who I think might surprise us.
And here's the performance draw order for area prelims, it may get shuffled but this is what it is as of now. I would also expect most of the area finalists to return, adding Lumberton in Atlanta's place thanks to both moving down a conference. (Lumberton was a 5A state band in 2017)
https://img1.wsimg.com/blobby/go/01cf2c57-dbf4-44f3-9ca9-a570517bcc43/downloads/1ckvac0f6_154652.pdf
The massive drop in 4A bands thanks to alignments probably means 4 state spots, but you never know, 2016 seemed to have a lot of "state year mercy" with bands getting their only 1 in that span during 2016