There's some. Didn't see a whole shit ton last time so I wouldn't expect a bunch more with the updates as it's just towns and a few monsters and such.
Obviously, together with all the new content comes a bunch of new custom items. It is true that we never add custom items "for the sake of adding them". If we feel like a certain object from real Tibia fulfills a certain role, or can be slightly modified to fulfill it, we prefer to use that one. When we see that we need a certain type of object, and there is nothing similar amongst the items of Tibia, we create our own.
Therefore, the more complex the content of the game becomes, the more custom items there are. Our whole end-game (level 250+) are based around custom items and gear, since there really aren't any real Tibia items for those level ranges (or at least with the features that we needed)