I don't believe the ricochet mechanic has changed. Bullets have the same chance of bouncing off armor and they'll glance off in some variable direction, just as they did before the patch. What has changed is that it's now possible for ricochets to damage you. Previously you couldn't kill yourself with an unlucky ricochet that comes back and hits, now the friendly fire is enabled on your own projectiles. The patch note for this change was incredibly poorly worded, making it sound like ricochets would always come straight back at you. I played half a dozen games tonight, saw plenty of ricochets and didn't have the misfortune of having one come back towards me. It could depend on individual weapons though, I saw one clip of a recoilless rocket round bouncing straight back from a Heavy Devastator shield and killing the Helldiver who fired it. Seemed... very not right, but I think you have to be pretty unlucky to experience a bad bounce that comes straight back and hits you.