I noticed that one Hydraulic system is gone.
From the typical 3 GBY the Blue is missing. Is this the result of a saving weight? how about redundancy?
yep, It´s for weight saving. Additionally the hydraulic pressure has been increased (like on the Concorde or on military aircraft) to reduce fluid volume and pipe diameter.
Additional electrically powered actuators are installed (two types, fully contained electrohydraulic ones, that just need electricity and a type that neds low pressure hydraulic fluid and electric power, so if all hydraulic pumps fail, these are still working, but if the hydraulic fluid is lost, they stop working)
Compared with the A340, the number of rudders and elevators is doubled, the number of ailerons is trippled. The total number of actuators is much higher. There are two hydraulic and two electric systems, so 4 flight control powering systems in total (same number as on the 747 and the L1011, more than on the DC-10/MD-11, 737, 757, 767...) So the overall redundancy should be higher while still saving weight.