It's true that it has too many variations, but probably the new one will have as well. I doubt that only 3-4 variations will exist, there'll be more - for devices, for logos, etc...

A refresh of the identity is a must every once in a while, it's the only explanation I see why the old one should be changed ;), but I doubt that their old docs will be redone in the new corporate branding, only the currently used will be redone and the new docs will use it.