I think Delta may be talking about what it intends to do if this open skies agreement between Aus and the US comes to pass. Would be a good thing though, any competition on that route would be a good thing.
If MH were to actually join Skyteam (and it seems like they intend to at some point, they're just being vague about when) then it would certainly start to make more sense for DJ to be involved with Skyteam. Having a local partner might even encourage some existing members to start flying routes down here. From what I can tell at the moment though the only Skyteam carrier that flies to Aus is Korean and only to Cairns, Bris and Syd.
Having said that, I still think it makes more sense for DJ to get into bed with *A. But it's all just speculation really. We live in hope.