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.