Don't sleep on James Martin. They just barely missed finals at BOA Denton in 2014 (.10 points behind Richland), and then later that year placed 6th at the St. Louis Super-regional. In 2015, 3 out of 4 of their directors were new, and they had a poorly designed show, so they placed pretty terribly at BOA competitions. This year, though the show is great and unique and they are working hard.
Also, I think L.D. Bell is going to surprise a lot of people this year and place in the top 3. Since they placed unexpectedly low in 2014, their last UIL State year, I guarantee you L.D. Bell will be coming for that 6A state title, and they are definitely capable. I'm sure they are very eager to return to their former glory.
I think James Bowie will also be exceptional this year after a lull for the past couple seasons (they've still been great, though!). I expect the top 10 to look something like this:
1. Hebron
2. Flower Mound
3. L.D. Bell
4. James Bowie
5. Marcus
(In no particular order)
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6. James Martin
7. Keller
8. Keller Central
9. Aledo
10. Coppell
(In no particular order)