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There are a lot of great changes and added a new features in the latest version of Adobe Photoshop CC. As I cannot write here all the famous features so you can check from there:
http://www.adobe.com/products/photoshop/features.html
It will help you alot.
The latest Adobe Photoshop CC2015 is you can syncrhronize your smartphone on it by continuing your projects done in mobile apps, a tools for your projects to be use in photoshop desktop version, or otherwise the desktop and mobile apps is syncronize.
Adobe photoshop cs7 and cs8 I think is most useful at present
The latest Adobe Photoshop CC2015