Very early in the year, but here is the breakout of the Top 25 by conference -
SEC - 7
Big 12 - 5
Big 10 - 4
Pac 12 - 3
ACC - 2
Big East - 2
Mountain West - 2
No surprise to see the dominance of the SEC, but a big drop off after that -- especially with the Big 10 only with four teams in the Top 25 (thank goodness they have Nebraska -- otherwise, they would be down to three teams).