The tour of India will be very important. By the time South Africa turn up, they will have had time to make changes and also assess the top players at first class level, so the difficulties will be immensely less, in spite of a tough opponent. Also the result of the series could set the stage for what is already apparent as a long season.
The series starts at Bangalore, where Australia have won both their last matches, while the home side has not won since 1995. That does bode well for the tourists, who then go to Mohali, where they have never played a Test. India will be very confident for the Third Test at Feroz Shah Kotla, which together with grounds like the Wankhede is where spin is truly effective and they dominate. However, there will be no 'raging turner' at Mumbai for this series, the final game is at Nagpur, a much tougher one for the home side, one that tends to like pacemen just a little bit and one which Australia will remember fondly from last time.
Mohali will be the key, if that plays in Australia's favour, it will put India under enormous pressure. Australia like to get the jump on the opposition, whether at home or afar and India's first task will be to keep them out of those first two games. If India win Mohali, they can be confident of the series.
I don't doubt that it will be hard for Australia to win, I don't see a lot of ease for India. Regardless of the state of the home team, Australia will bring an untried attack for such a tour of India and often surprise and innovation are as good as experience. It's definitely not a tour for which you expect either side to whitewash.
The Indians themselves do not have a comprehensive bowling attack and will obviously prefer to fight through spin, likely Kumble and Harbhajan. I think it's interesting then, the choice of grounds. Nagpur will be blacklisted in both spinner's books as it is surely their least favourite Indian ground, while Mohali can be no favourite. Harbhajan will recall taking 11 wickets against Australia at Bangalore, but in a match that Australia comprehensively dominated, it is a bittersweet highlight on an unrewarding ground.
If the series went to Kolkata and Mumbai, then maybe it would look like an unachievable goal, but it doesn't. It actually goes to grounds that could pose problems for India. One win might work in a 3 match series, but it's not much in 4, so expect some cat and mouse. This is a series that definitely stands to live up to potential.