Where to download: Yes this is free.
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What's new?
"Before we get started, its important to note that Photoshop CS6 is a major release. The Photoshop team spent a lot of time streamlining the interface, working on new features, and fixing older ones. For instance, the new interface includes over 1,800 new icons and 250 cursors. Each of these icons had to be customized to work with the new darker interface. In addition, the Photoshop team also spent some time fixing inconsistencies in the UI and rearranging menu items. This is something that hadnt been done in over 22 years. In addition to the new interface, Photoshop CS6 now includes new performance improvements that will enable you to work faster and more efficiently.
Photoshop CS6 also includes long awaited features such as the ability to edit vectors in much the same way as you would in Illustrator, the ability to easily add strokes and dashed lines, as well as new ways to organize your layers, and lets not forget about new background save and auto recovery features. Photoshop CS6 is a major upgrade that has more than 62% more new features than CS5 had over CS4. It also includes 65 user inspired enhancements that were a result of Adobes efforts to reach out to its customers through blogging and social media channels. It is changes like these that make us extremely excited share with you some of what you will see in Photoshop CS6" (From psd.tutplus.com).

Read the full article at psd.tutplus.com

Please note that this is completely LEGAL.
This was released by Adobe.

Have fun.