Those rumors of a 4K-capable Chromecast dongle just got more substantial. Evan Blass (who has a knack for accurate leaks) has posted an image of what he says is the Chromecast Ultra. The device itself isn't remarkable -- surprise, it's a puck with an HDMI cable attached. However, it might just say a lot about Google's plans. To start, its very existence corroborates talk that Google's October 4th event is about much more than new phones. And notice how it replaces the Chrome logo from earlier Chromecast models with Google's increasingly ubiquitous "G?" That lines up with the logo seen on the back of the company's leaked Pixel phones, as well as test versions of Chromecast firmware. Clearly, Google is aiming for more harmonious hardware branding.