Recent rumors shows that the long rumored Canon EOS 7D Mark II will have an integrated grip, which is like a “Baby Canon EOS-1D X”. With this bigger battery in it camara body, 7D Mark II autofocus an EF lens faster than LP-E6. This maybe a good news for sports and wildlife photographers.
As what Chuck Westfall said:
In addition, the EOS-1D X achieves a higher lens motor drive speed with select L-series USM telephoto lenses than the 5D Mark III because of the 1D X’s more powerful battery pack.