Apple today seeded a sixth beta of OS X Yosemite 10.10.2 to developers, just a week after seeding the fifth beta of OS X 10.10.2, and two months after seeding the first beta.
The new beta, build 14C106a, is available through the Software Update mechanism in the Mac App Store and through the Mac Dev Center.
As with previous betas, Apple asks developers to focus testing on Wi-Fi, Mail, Bluetooth, and VoiceOver. Many Yosemite users have had some ongoing problems with Wi-Fi since the new OS was first launched in October, and a November 10.10.1 update did not resolve all of the lingering issues.

Apple today seeded a fifth beta of OS X Yosemite 10.10.2 to developers, just one week after seeding the fourth beta of OS X 10.10.2 and nearly two months after seeding the first beta.

The new beta, build 14C99d, is available through the Software Update mechanism in the Mac App Store and through the Mac Dev Center.

As with previous betas, Apple asks developers to focus testing on Wi-Fi, Mail, and VoiceOver. Many Yosemite users have had some ongoing problems with Wi-Fi since the new OS was first launched in October, and a November 10.10.1 update did not resolve all of the lingering issues.

Apple today seeded the third beta of OS X 10.10.2 Yosemite to developers, just over two weeks after seeing the second 10.10.2 beta and over a month after releasing OS X 10.10.1 to the public.
Like OS X 10.10.1, as a minor update, OS X 10.10.2 is likely to bring bug fixes and performance improvements to the operating system. OS X 10.10.1 introduced several reliability enhancements, including improvements to Wi-Fi, but many users have still been reporting issues with Wi-Fi stability in Yosemite.
In the release notes for the third 10.10.2 beta, Apple asks developers to focus on Wi-Fi, indicating the update may fix some of the lingering Wi-Fi problems. Apple also asks developers to focus on Mail and VoiceOver.

Apple today seeded the first beta of OS X 10.10.2 Yosemite to developers, just three days after releasing OS X 10.10.1 to the public.

The new beta, build 14C68k, is available through the Software Update mechanism in the Mac App Store and should be available in the Mac Dev Center soon. The beta also includes Safari 8.0.2 and an update to the Mail app (version 8.2).
Like OS X 10.10.1, as a minor update, OS X 10.10.2 is likely to bring bug fixes and performance improvements to the operating system. OS X 10.10.1 introduced several reliability enhancements, including improvements to Wi-Fi, but many users have still been reporting issues with Wi-Fi stability in Yosemite.
Beware: It appears that OS X 10.10.2 is causing the latest version of Google’s Chrome browser to crash. Retina iMac owners are also seeing display issues with the beta.