I'm sure this was all announced circa 2010 as part of the ten year forward plan. Can't see it being in place for 2020.
Most of it got scuttled when Frank Lowy took them to court and won which meant that T2 extensions couldnt happen until Lowy's lease expired. Then they wanted to align the terminals with alliance partners but that got canned. Then there was supposed to be a new maintenance hangar built which looks like it will now be T4.