Canon 6D and taking pictures of kids ?

Hi

I know the Canon 6D is still very new... but the ones of you, who have already got it. What do you think of the auto focus of moving objects, such as fast moving kids, running around.

Is it fast enough to catch kids play - they can as you know be pretty fast from time to time

I am considering the Canon 6D upgrade from Canon 60D.

I also had the 5Dmk3 in mind, but for a smaller amount then then the body price of 5D, i can get the 6D kit w. 24-105, so price is an option.

Thanks for your input.

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Regards
Peter
Equip: Canon 60D, Canon 17-55 f/2.8, Canon 70-200 f/2.8L, Canon 17-85mm, Canon 75-
300mm, Canon 50mm f1.8, Sigma Flash, YN-560II.