A handful of Google sites, including its Android TV page, still reference Google Cast. It's also less likely to go away for developers.

But why the name change now, especially when Google actually moved away from the Chromecast label a while back? We've asked the company for its take. However, it wouldn't be surprising if this is a matter of brand recognition combined with Google's growing hardware ambitions. The odds are that you're more familiar with Chromecast devices than the code that powers them -- "Chromecast built-in" gives you a clearer idea of what's possible, and reminds you that Google makes its own streaming gear.

Update: Google tells us the branding change is to "help users identify the technology that they've come to enjoy and appreciate." The official switch doesn't take place until 2017 -- that's why you're seeing a gradual shift.