Adobe has not announced official pricing and availability of Photoshop CS6. Stay tuned.
You can find the pricing info of Photoshop CS6 on this page: http://www.adobe.com/products/photoshop.html or on the Adobe Store of your country.
If you intend to purchase several programs, check also the prices for the Creative Suites: http://www.adobe.com/products/creativesuite.html?promoid=JOLIS and the new Creative Cloud option: http://www.adobe.com/products/creativecloud.html?promoid=JQPEQ as it might be a better option for you.
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