What's obviously different? What's working better for you now? What's not as strong as it used to be?
I haven't had much time to play but so far the headshot change really seems to make fights last longer at long-range because you are both less likely to get a lucky headshot. This makes the Grendel much stronger since you can get precise bodyshots at long range-- it also makes all the single-shot attachments and sniper rifles better at long range. This is probably the main reason OSG got slightly nerfed-- was so that it stayed about the same with the new long-distance balance.
Module balance doesn't seem TOO different. Weapon Pro, which I already used for the most part, seems slightly stronger.
Mobility Enhance is still amazing and probably still the obvious choice-- so goes to show how smart the nerf was.
Not really noticing a significant difference with nano-recharge, but I'm only at tier 2 so far. Energy Enhance so far hasn't seemed to actually affect how things go very much-- obviously I'm operating with less energy, but that seems to be reasonably easy to compensate for.
The Jackal Single-shot still seems just as strong, thank goodness. I'm presuming that while they nerfed it, the corresponding nerfs to other weapons made up for it. Haven't tried it outside single-shot.