Christoph sent me this image and text:
I made a post today on Sony Alpha Camera (Facebook). It is about the idea of a vertical battery grip with an integrated 1TB SSD and a USBc port to record videos in better codecs like an external recorder (e.g. Atomos) and remove the 30 minutes recording limitation. There are many positive reactions to this.The photo shows the grip on an SSD. So the handle wouldn’t get much higher.
I think this is a smart idea. Wonder if someone will contact Christoph to jelp him produce and sell this gear.