Today Sony announced the previously rumored a7s full frame camera with a 12MP sensor, 4k video recording capabilities (on external media, like the new Atomos Shogun 4k recorder) and high ISO setting of 409,600. The a7s price is not yet announced.
Sony is going to announce a new a7s full frame mirrorless camera on Sunday during the NAB show that starts tomorrow. The new model will most likely have a new 12MP sensor and 4k video recording capabilities and faster/improved AF system.