I don't know about freight versions of the a330/340 but I do know that airbus is going to make a freight version of the a380..It will be the a380-200F
Maximum take-off- 583t
Maximum Landing - 427t
Maximum Payload - 150t
RANGE- 10,410 (shortest of the A380 family)
Fuel Capacity(litres)- 325.000
Cruise Speed- M0.86
engines?- R-R Trent 900 or GE-PW of 75.000 thrust.
HOPE IT HELPS!