1. Edit Feed Posts and Comments:
https://www.infallibletechie.com/2015/07/editing-feed-posts-and-comments-in.html
2. Sharing Files to Library:
https://www.infallibletechie.com/2015/07/sharing-files-to-library-in-salesforce.html
3. Sync Content Files:
https://www.infallibletechie.com/2015/07/sync-content-files-in-salesforcecom.html
4. Sync Content Files to Folders.
5. Manage Custom Object Records to Groups:
https://www.infallibletechie.com/2015/07/1.html
Force.com
1. Setup Assistant for Newly Activated Organizations:
https://www.infallibletechie.com/2015/07/setup-assistant-for-newly-activated.html
2. Data loader for Mac OS.
https://www.infallibletechie.com/2015/07/salesforce-data-loader-for-mac-os.html
3. Login Access Policy Changes:
https://www.infallibletechie.com/2015/07/login-as-other-users-in-salesforce.html
Mobile
1. Customize Action Bar in Salesforce1:
Developers can choose to override the predefined actions and specify separate sets of actions to appear in Salesforce1 and the web interface
To support this new feature:
1. Actions category in the palette has been renamed to Quick Actions.
2. A new category, Salesforce1 Actions has been added.
3. The Actions in Publisher section in the page layout has been renamed to Quick Actions in the Publisher.
4. A new section named Actions in the Salesforce1 Action Bar has been added to the page layout.
2. Lightning App Builder:
The Lightning App Builder is a point-and-click tool that makes it easy to create custom pages for Salesforce1.
Service Cloud
1. Macros:
https://www.infallibletechie.com/2015/07/macros-in-salesforce.html
2. Adding charts to Console Side bar:
For Release Notes, check the below link
http://releasenotes.docs.salesforce.com/en-us/summer15/release-notes/salesforce_release_notes.htm
Cheers!!!