It will be interesting to see what their fares are going to be. It could cause a real headache for Jet* and Virgin Blue.
If you do a mock booking on their website, their 'regular' price PER-SIN is AUD$148 one way - this is cheaper than most domestic flights offered by Jet* and Virgin Blue
Being half owned by SIA, they are coming in with a hell of a lot of resources behind them!
It will be interesting to see what they plan on paying tech & cabin crew