Hobby King has come out with 2 new multicopter motors in the 9014(!) size. One is 105kV, the other 135kV. With 385g, they are surely on the heavy side, but they are designed for 6S with a max current of 40A. According to the description, they were made for 26" props.
Surely nothing for your everyday sport quad, but now there's finally motors available which would allow building really big quads (MD4-1000 class and bigger) with reasonable air times.