I haven't heard of any changes to walls in the patch, but there may have been stealth changes, although I doubt it?
As for performance, expect catapults to perform decently against ancient walls (but suffer against ancient walls + archer), trebuchet to perform decently against medieval walls (but again suffer against medieval walls + crosbowman), whereas bombards will probably continue to perform poorly against renaissance walls, although I don't recall if there was a bump to bombard strength which may help them?
Getting them to the 2nd promotion (increased damage against district defenses) will help them greatly, but bombards will probably still need to show up as corps or even armies to do any significant impact against renaissance walls, at least against a technologically advanced opponent.