
Apple today seeded the first beta of an upcoming OS X 10.10.1 Yosemite update to developers, nearly three weeks after first releasing OS X Yosemite to the public.
The new beta, build 14B17, is available through the Software Update mechanism in the Mac App Store and through the Mac Dev Center.

Apple is asking developers to focus on Wi-Fi, Exchange accounts in Mail, and the Notification Center.
Article Link: Apple Seeds First OS X 10.10.1 Yosemite Beta to Developers