Flagship phones to look out for in 2015?

With IFA happening in less than a month, and the first wave of flagship phones from the big guns expected to début at the show, what phones the boys and girls on the forum looking out for?

For me the Sony Z4 sounds promising.
Rumours of an octacore snapdragon 810 processor, 4GB of ram, 64GB internal storage and quad HD screen running lollipop are very interesting.