They didn't mention anything about new mechanics relating to the HRE, which was strongly implied in the artwork which seemed to depict the Walk to Canossa. I'm still hopeful that the HRE overhaul crowd will get something in the way of new content for the HRE, perhaps something that allows them to restore the Roman Empire or drift towards being less of a blob.
I just think it needs a general flavour and mechanics overhaul. It isn't your normal empire after all.