High to Low- I assume as you are from Darwin, and all airbus, you are Jetstar.
Here is the deal- Ek will place you where they need you. Period. Forget about when the 330 is going etc. They still have the 330 - if they need 330 drivers you will go there, especially as you have all airbus time. They can predict ahead 3 weeks max, (even that is doubtful). 330 only f/0s at the moment who are junior to 330/340 FO/s are going to the 380.
I have heard that there is going to be continual commands to the 330 - to the number of 30 or so for the next year. Have also heard a bunch of cadets are to start on the 330, as well as contuinual hiring for the 330 off the street.
If the demise of the 310 is any indication - expect the 330 demise to stretch out a longing time after they are currently saying.
The 350 is not a factor at the moment. (Though someone in the ivory tower knows that deal)
If they need you on the the 777 then so it will be.