I recall reading that they were doing away with hydraulic systems altogether. They are heavy, and all those heavyweight steel pipes, inflammable fluids, (4 hydraulic systems on a 747), jacks and flexible joints failing merrily......makes sense. I'm sure it will be the way of the future. I think it is also doing away with air systems as well- must be rather large pressurisation motors? I would imagine the engines will each have attached a couple of alternators bigger than the engines!