The fact that there are axes, maces, swords, daggers, staffs and shields mean that bethesda will already have to think about a great many kill moves to keep the idea from becoming dull and repetitive. There are only so many finishing moves you can make for a two handed hammer – namely hammer connecting with head. (Perhaps they will have to make them a bit longer to give some variation? I think the mark of chaos trailer had some good ideas for hammer-kills)
The dual wielding system adds even more problems to the mix – players can use a nearly endless combination of different items, are they going to try and work out sync kills for each combination, or just develop some general dual-wield sync kills?
I think Dark Messiah had a good system for staff combat. Do we think we should be able to fight with a two handed staff? Or staff'n'sword, Gandalf style?