Okay, okay. So I didn't actually download the patch myself. Some well respected modders in the community have been downloaded it and have noticed some extreme bad stuff. Slots no longer work on CC. According to the modders who are in the process of testing this right now: "it actually affects everything that contains slot resources in the package - which will be almost every object ever but only noticeable on ones where the slots are used for interactions".
From what they are seeing, EA changed how slots work so their content will be seamlessly updated. But any custom content that (as mentioned above) contains the slot resources in the package, the slots will not update to this new version. It will have to be hand fixed by each creator. It doesn't seem like there should be a problem for anyone that does not use third party content.
I AM one of those people who uses third party content, and love it, and am extremely disappointed that such a thing has occurred. I have a good number of CC cribs, tables, beds, etc and am not interested in losing them, just so I can play the game. Therefore, even though my Pets was preordered and is available for pickup tomorrow morning, I doubt it will be installed and patched until there is either a fix or my favorite creators get a chance to update their items.
Creators out there, I feel for you! I hope that you don't get too discouraged and will fix your lovely items for us. Not that I blame you if you choose to do otherwise. This is a sad, sad day for the modding community, especially given that there was no warning, notice, anything from EA to even hint that this could be a problem. Epic fail EA, epic fail.
So, the Avendales may have to wait even longer for me to get back to them.