in no time.
I won't be doing previews this season since it can become a bit redundant given all the coverage this league gets.
My recommendation would be to go ahead and purchase the Football Outsiders Almanac. It's the perfect mix between advanced stats and practical analysis that gets you up to speed on every team, and it's a much higher quality breakdown than what you'll find on national websites or magazines.
If you're just in it for casual fun, check out Andy Benoit's stuff on MMQB and Bill Barnwell's upcoming previews on Grantland.