I like aussie's side as well.
I think the selectors are fairly set on picking 3 quicks and 2 spinners in the 12 in each game and rotating the third seamer with MacGill based on the pitch, and I imagine that will continue until the Ashes.
McGrath, Lee and Warne are certainties barring misadventure, and I think Bracken has the inside running for the third quick spot. Between now and then, Bracken's got a chance to prove himself first against South Africa and then in Bangladesh. I think it's likely that if he can show himself to be a major force in swing friendly conditions and economical in non-friendly conditions he will retain his place. With McGrath and Lee in the team, I don't think the selectors (or Ponting) would be too displeased with the next seamer being able to keep it tight at the very least, and occasionally be a real force. If he's taking 1/40 off 20 overs when the ball is swinging though, he'll go.
In order for Tait to get the spot, he'll firstly need Bracken to fail, and secondly make the very most out of whatever chances he gets in the near future. It's obvious that the selectors have removed him from the equation for now based on his efforts in England, and he'll need to finish this Pura Cup season strongly to get back into the mix, and then turn it on as soon as he gets picked for Australia to keep his spot.
Gillespie is gone, in my mind, and I'd be surprised to see him play again. I certainly think he's good enough, but I just doubt they'll be willing to go back to him - same as Martyn and Katich.
Watson needs to show something one one discipline or another in South Africa. He's likely to get picked for the tests in my view, and if he either performs once or twice with the ball or makes a big score with the bat he'll get a good 6 months leeway afterwards to try and mature into the all-rounders role. If he has a genuine shocker, I think they'll discard him for a while and we'll be looking at 4 bowlers and 7 batsmen in the Ashes.
Langer, Hayden, Ponting, Hussey and Gilchrist are obviously certainties. The only "if" in the batting is about the 5-6 spots. I'm inclined to agree that Clarke will be back in the Australian team at Hodge's expense by then, but really that will hang on how well Hodge bats between now and then. If Watson doesn't cement his spot as the all-rounder, it'll be both Hodge and Clarke.