Brisbane has already completed all its games in this World Cup. The three QF's for Australia are in Sydney, Melbourne and Adelaide. The one semifinal in Australia is at Sydney. Also according to this Cricinfo Groups page, Australia have already been assigned to Adelaide (March 20th) for their quarterfinal regardless of where they finish in Pool A. And they will play in Sydney if they qualify for the semifinal - ICC Cricket World Cup 2015 | ESPN Cricinfo
Let India first cross the QF stage. I am interested in seeing who our potential quarterfinalist will be. Even a single slip up for us in the remaining 3 league games could potentially push us down to No.2 in the group (seeing the way SA are blanking out other sides). In that case, we will most likely play Sri Lanka in the quarterfinal at SCG on March 18th. If we finish at the top of Group B, we will play England or Bangladesh at the MCG on March 19th
Ok so if its AUS vs IND in the semi then we will have to play AUS in Sydney. That is much better I think even though a win is not guaranteed but I think we would have a great shot on the Sydney pitch against them. I would even think about going in with three regular spinners, Jadeja Ashwin and Axar. Let's not worry about that till we get there though. Also, I would rather have India play England in the quarterfinal because I want to see Kohli destroy Anderson to all parts of the ground. If we remain undefeated in the group stage then I see us going all the way to the final. Also, the SL and AUS game should be really interesting because it is in Sydney. If SL wins then we could possibly be looking at a semi between Ind and SL.