Sony will have a “Pro Video Presentation” on May 29 in Berlin. That is what the text says on the official Schau! 2015 homepage. Don’t know what exactly that means but let’s hope this means an E-mount camera with internal 4K recording will be announced on that day :)
P.S.: Other companies like Panasonic and Fuji will show their new cameras (G7 and X-T10) on the same event.