The all new Sony A7s is now up for pre-order at B&H Photo HERE or Amazon HERE at $2,498.00. This will be a full frame monster of a low light shooter. I mean, ISO 50-409,000! 4K video capable and more. Ships July 8th 2014 but pre-orders will always get the 1st shipment! This one will be popular just due to the insane low light capabilities. Slap on a 50 0.95 and shoot in the dark!
Take a look at the official Sony video showing an example often ISO possibilities.
And the video possibilities: