Was this fixed with the latest update?
I had to do some hackery to get around this, but I haven't checked since I updated today (nov 13). I'm working on a card game, and I was nesting cards with the assumption that the z-ordering of the cards would be taken care of by parenting game objects. I'm very happy to hear that this is going to be cleared up, as its the very first issue that's caused me to think about looking elsewhere.