Wall pathing is DEFINITELY better. Troops don't automatically try to go to get off the walls and get back on when told to move from one position to another. They seem to be faster than they were before as well.

They automatically make use of cannons without having to manually target units at long range. And cannons are actually somewhat effective.

It seems like musket range is still the same, though. Units have to be RIGHT at the foot of the wall for regular line infantry to fire at them.

Defenders on the wall seem to have a bonus, now. I had a unit of line infantry thrash some grenadiers (in AUM, so the grenadiers had equivalent numbers). Very good, I think.

Overall, it might actually be worth using forts now. The walls are defensible at last. You shouldn't need to rely on the flag-bait trick if you've got enough men to man the walls decently.