According to John Nack’s blog (the Adobe Evangelist and Blogger) If you own a CS3 or later Adobe app, you can subscribe to Creative Cloud & get all the CS6 apps, 20GB of storage, and more at a huge discount ($29.99/month instead of $49/month in the US)–but note that the offer ends August 31st.
Check it out: http://blogs.adobe.com/jnack/2012/07/40-creative-cloud-discount-ends-in-one-month.html