So, out of 4 matches I have played thus far since the new patch, I have seen 5 people get stuck; I myself have been stuck twice, one of my lancemates was stuck once, and two other players were stuck, and were bouncing up and down on a wall.
These all occurred on nearly-vertical surfaces on Frozen City, Forest Colony, and River City Night.
The stuck mechs were an RVN-3L, a CDA-2A, a CDA-3M, a Yen Lo Wang, and a Centurion of some sort (did not see the type).
This has NEVER happened to me before this patch, and I have only seen someone get stuck once beforehand.