How to Install OS X Yosemite on New Partition and Dual-Boot with Mavericks
Consumers will soon be able to try out a beta of Yosemite

Alongside beta 3 of iOS 8, Apple has now seeded the third preview of OS X 10.10 Yosemite to developers. The new version comes only three weeks after Apple released the second developer preview and over a month after it unveiled OS X 10.10 at WWDC.

Users can download build 14A283o from the Mac App Store or the Mac Dev Centre. Installation is simple and requires users to drop the OS install package into the apps folder. Watch the video below for detailed instructions on how to install OS X 10.10 Yosemite Beta 3.

For the uninitiated, apart from a UI refresh, Yosemite brings to OS X a multitude of new features aimed at making your iPhone and Mac work smarter together.

OS X Yosemite is now available exclusively to developers. However, Apple plans to offer a beta version of the software to Mac users in the near future. The final version is expected to be available to the public this autumn, after the company has released a number of beta iterations.

New features include Dark Mode, which is now officially available in the third beta. Previously, users could only turn it on through the terminal command. Apart from this, Quick Time has an updated icon, and sections like System Preferences, Mail and iCloud have seen some interface tweaks. Also added are larger app icons for notifications and a new font for the Notification Centre/Safari Favourites Bar. There have also been a string of changes to the Settings area.