With CS6, though Adobe will be introducing their own version of SaaS in the Creative Cloud. For those who aren't familiar with the term, it stands for "Software as a Service," and allows subscription access to the full creative suite for a monthly subscription price - $50 a month for a yearly subscription, $75 a month on a month-to-month basis, with certain apps available for individual licensing for much less (as long as you pay on an annual contract). One obvious benefit is this allows content creators, who previously may have felt forced to pirate by the price point, to legitimize and use a legal version of the software with a more reasonable monthly expenditure.
The down side? Adobe isn't Rent-A-Center, and there is no rent-to-own option. You could pay on a monthly basis until you've completely covered the price of the software suite, and the software still wouldn't be yours; the second you cancel your subscription, you'd lose access. But this is rather a moot point, when it would take years to completely pay out the cost on a month-by-month subscription. By then we could be on CS7 or CS8, and can simply transfer the subscription without having ever paid full price for the CS6 suite. With cloud storage included in the package, that's not too bad at all.
I know I'll definitely be using the subscription service when I upgrade from CS5.5, though I haven't decided if I'll use it just for Flash and Photoshop, or go for the full suite. What about you? Do you intend to subscribe to Adobe CS6, pay full cost, or let it slide entirely?