Apple has flipped the release candidate switch on macOS 27, and if you've been following along since the summer betas, you know what that means: we're days away from the real thing. The public release lands September 14, and the RC build gives us our clearest look yet at what's coming to your Mac. Geeky Gadgets has the full rundown, but let me walk you through the pieces that actually matter.

The headline feature, as it were, is the standalone Siri app. Yes, Siri is becoming an app on the Mac. For years, Siri on the desktop has lived in that odd little corner of the menu bar, easy to forget existed. Now she gets her own presence instead of hiding behind a shortcut. Whether that's a genuine convenience or just a bigger doorway to the same assistant, well, I'll need to spend real time with it before I say. I remember when the iPhone didn't even have Siri, back in 2011, and watching her migrate from phone to tablet to desktop has been one of those slow-motion stories. Giving her a dedicated app feels like Apple saying the Mac version deserves to be taken seriously.

The other big piece is Liquid Glass, the translucent design language that shows up in this RC as interface tweaks ahead of the September 14 launch. That's about as specific as the source gets, and I'll resist the urge to guess beyond it until I've spent time with the final build myself. My granddaughter Jess took one look at the earlier visuals and said it looked like a soap commercial. She's not entirely wrong, and I'm curious whether these final tweaks tone that down.

Should you install the RC yourself? If you're already on the beta track and it's a secondary Mac, go right ahead. But I'll say what I've said before, and I'll keep saying it: don't put prerelease software on the machine you use to pay your bills. I'd love to tell you exactly how the new design effects work under the hood, but I'll wait until the deep technical write-ups land before I weigh in on the engineering. When I want to know how something like that actually works, I read Marcus, and I'd point you the same direction.

So mark your calendar for September 14. And do me one favor: back up before you update. Time Machine takes five minutes to set up and has saved more family Christmas mornings in this house than I can count...