You can record the 4K raw information via Thunderbolt to an external drive, but most impressively, the Quad can actually de-bayer the raw information and provide 4K, 2K or HD ProRes files to the removable SSD drives. The de-bayered information can also be sent out via SDI to your monitors. Even if you're not interested in 4K raw recording yet, the Quad is also a 4:4:4 10-bit recorder, making it incredibly useful for many applications.
Other interesting items I saw at the AJA booth included the Ki Pro Rack and T-TAP. Like the name suggests, the Ki Pro Rack is a 1RU rack mountable Ki Pro that uses the same drives as the original Ki Pro. The T-TAP is a self-powered Thunderbolt adapter that allows you to output your computer display via HDMI or SDI. Additionally, the Ki Pro Mini has been updated with full Avid DNxHD support available as a free software update now.
Watch my videos to learn more about these updates from AJA.