I suspect you are going to see an expansion of engineering that will handle QF737. Obviously not going to replace Melb maint base, but give them some much needed options in the west.
PH airport is a dogs breakfast. Probably a good move by QF as they will have somewhere else to park their fleet o/night. The 600 lane is full almost every night. Increasingly you will see at least 3 or 4 B767's in addition to the 10 odd B737's.
With them already having the B717 deal with Cobham I think there is more to this than just fleet and services.