I've now played a number of games with the new patch. One observation I can make is that regiments are definitely aware of terrain and cover bonuses. Regiments will now march to and stop at fence lines and stone walls and begin firing. They also seem to know that having the higher ground in a fire fight is also a good thing. Kudos to Norb & Co. for finally getting this aspect of the game to work. The player can no longer just send his men into attack without regard to the enemy's surroundings.
Let's hope that the next 'minor' patch produces these sort of surprises.

I can make this march and I will make Georgia howl.