Apple released the second Yosemite public beta for beta testers, following the release of the sixth Developer Preview earlier this week. Apple has also released a new version of iTunes 12 for Yosemite.
The software update, build 14A329r, can be downloaded through the software update function of the Mac App Store.
It’s likely the new public beta bundles the content introduced in the last several developer updates, including multiple design changes added with DP 6. The last beta included new wallpapers, a new System Preferences design, a translucent dashboard, several icon updates, and more.