Right, so what we've seen in the update so far:
1. Some functions now have trash code to break patterns used for GSC injectors.
2. TAC has seen some updates, nothing major. It currently accepts requests to CRC a range or module, get the value of a DVAR as int64 or float, execute a standard expression.
3. The bulk of the update seems to be the .img file that contains code which is executed by TAC. I have not investigated it since we will probably not support the new version.
4. Some fun DVARs are removed, as mentioned. I guess they were being abused.
5. One of the 3 remote code exploits have been patched. It was used by bad guys to leak PDB files so it's the main reason for the patch.
6. Updated some IDs for the store to properly promote COD:AW.
7. Some piracy checks for the people that unlocked all DLC.