Apple today seeded build 14B23 of OS X 10.10.1 to developers, one week after seeding the first OS X 10.10.1 beta, build 14B17, and nearly a month after first releasing OS X Yosemite to the public.
The new beta 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 Second Beta of OS X Yosemite 10.10.1 to Developers