Apple has recently released version 2.0 of their OS X Yosemite public beta. It did not provide a rundown of the changes in the update, only stating "this update is recommended for all users". There are not any major noticeable changes apart from a few aesthetic refinements and other small details.
Aesthetic Redesigns: as you can see in the pictures above, Apple has made some slight changes to the device connection icons as well as the icons in the Settings app. Nothing major. Looks like Jony Ives is really pressing his team on paying attention to the finest of details.
Click through to find out what else has changed: