What sort of "Wow" are you waiting for? If you use a 1Dx then you know that incremental improvements are the hallmark of 1 series bodies, not big groundbreaking "wows."
Fully functional touch screen, better autofocus with eye detection, something to replace the compact flash slot (two Cfast or 1 Cfast and one SD?), maybe a slight boost in frame rate, 30-32 mp sensor, add an autofocus selection lever/switch like either the 5D IV or 7D II. Some other features that will be nice but not revolutionary. What more would you want/expect?
The only thing that I can think of that would be a wow! would be if they somehow made the touchscreen on the back have the same function as the EOS R series, where you can use your thumb to move the focus point around. But, I think that is probably not possible with an optical viewfinder, so not getting any hopes up there.