It'll be a three class A330-200 (didn't know GF still offered First Class, but the Irish Times says it and presumably was briefed by GF itself).
Cop a load of this:
http://www.jetphotos.net/viewphoto.php?id=507945
The IT also says that Aer Rianta/DAA has been in talks with GF over this for more than a decade and is currently in talks with up to 20 other airlines.
Interestingly, the size of the market (Asia generally, not just Australia) is put at about 190,000, based on a figure of 16,000 inbound pax from these areas in March. Presumably, the monthly figures will be even higher for Summer and of course, once a direct service is introduced, that should help further. Remember that one of the key benefits is that we will now have a respected airline with an incentive to market Ireland throughout Asia, the Middle East and many other markets.
Message to EI: if you want to fly to Asia, beef up the service product NOW!