Sony Global - Digital Imaging - ?7S (http://www.sony.net/Products/di/en-us/products/vq5f/index.html)

Game-changer. needs external recorder for 4k function, but low light capability is incredible. Would make a great 2nd camera for EA50 for doing lowlight and b-roll on slider and/or portable jib. Want one, but no pricing as of yet with a release of summer 2014.

You have arrived too late at the party, discussion allready going on here: http://www.dvinfo.net/forum/digital-video-industry-news/522596-new-sony-a7s-shoot-4k-video.html