Disappointed to see, but CA have an agenda with giving Clarke as much international captaincy as possible. But really, t20i is so helter skelter and dynamic, incumbency really shouldn't matter as much in this format as in tests. Form players should be given precedent.
That being said, aside from Clarke and Haddin, that squad is super duper. It would be interesting to see how the Saffers experiment with ABdeV works out, and whether it would be applicable to Australia in one way or another.