The list revolves around the big hexwraiths units taking on what ever needs to be hit hard. Olyander with her defensive shrugg can now chuck herself into the middle of any battlefield so she can maximise her mortal wound damage. The smaller units are just great at harassing small characters and units which become separated from the main army. They are also cheap objectives scorers so you don't need to commit your army turn 1 unless you want to.
Unfortunately you will have to wait and see about AoS 3, hopefully not too long to wait.