From what I hear they are looking at V2500s. They are talking about a mixed fleet between A319/320/321.
Minor differances between V2500 and CFM powered A320 series aircraft in the cockpit, the V2500 are a litle better in the climb above FL200. V2500 have a couple of extra things on the overhead panel. The engine parameters are a little different on the upper ECAM. The aircraft status page on the MCDU tells you the model number and engines installed.
The A319 comes with the V2500 or V2522 engine, the A320 comes with either the CFM56 or the V2500, and the A321 comes with the V2533.
If you are going for a mixed fleet of A319/A320/A321 the V25XX engine is the best answer. The engines are all about the US$3.5 M each, little difference between models.
As all the aircraft appear on the same type certificate data sheet in France (DGAC) and the US (FAA) and Australia has direct acceptance of aircraft from these countries little needs to be done for the "first of type".
I would imagine that the aircraft will become a class endorsement in Australia, where the A320 will cover you for the A319/A320/A321 with the CFM and V25XX engine configurations, ie
A319 Model -111
A319 Model -112
A319 Model -113
A319 Model -114
A319 Model -131
A319 Model -132
A320 Model -111
A320 Model -211
A320 Model -212
A320 Model -214
A320 Model -231
A320 Model -233
A320 Model -232
A321 Model -111
A321 Model -112
A321 Model -131
A321 Model -211
A321 Model -231
The first digit in the model number indicates the engine manufacturer.
Z