I know an old smart FBPRO player who once said that too many teams focus on offence and all that glitz versus defense. I work to expect to keep my opponents to 20 points or less each week. I can only speak to what I perceive from my weekly game planning, but it does appear that most teams spend more time on the O side.
From an O perspective I saw a couple of opponent trends. First was the heavy PMM on second down. The first half of the season more teams moved to what looked like 80% PMMM on second and 6-10 and even the other yards to go. It seemed to be an attempt to follow what the Jets have been doing. (I for one can never find a way to mimic the damn Jets. No matter how hard I try my QB and WR's are just are not as effective with it.

) As the season progressed, I saw some shift back to a little more balance. Second, it seemed certain successful teams ran the ball more successfully. I haven't ran those numbers league wise yet, but my sense is running made a small comeback at times this season. I even noticed a team must have ran like 150 offensive PRD plays which would seem to be a bad strategy that likely helped the opponents more.
Defensively, I noticed more teams using things similar to my stuff. I struggled a little offensively until I adjusted a bit. I also noticed several times people ran very limited plays in a category and in calling. I have always thought it was poor strategy to only call the same 5 plays the majority of the time. Sure, if we guess right it is great, but we are playing against a human and odds are we will not hit as well as we plan. Hence my theory to use more plays and calling on defense to cover my bases. I always want some answer to my opponent and hope my D coordinator makes the right calls during the game. I definitely lean to cover what I expect the most, but like something in my back pocket. There are a couple of teams, Atlanta, Chicago, and this season Detroit that will change some things 100% opposite on you.
We also just seemed to have a few teams really struggle and the "punk" Cardinals

have a weird season. This likely boosted things a bit. We should probably put together a series of charts with several O and D data points and watch trends over time. It would be interesting each season to see any changes.