If you’ve been waiting to upgrade Photoshop CS3 or CS4 to CS6 when it’s released sometime next year, here’s some bad news: the upgrade price won’t apply to you. Starting with CS6, Adobe will be enforcing a new upgrade policy:
[...] we are changing our policy for perpetual license customers. In order to qualify for upgrade pricing when CS6 releases, customers will need to be on the latest version of our software (either CS5 or CS5.5 editions). If our customers are not yet on those versions, we’re offering a 20% discount through December 31, 2011 which will qualify them for upgrade pricing when we release CS6.The existing policy is that customers with software from three versions back quality for upgrade pricing. For example, owners of CS2, CS3, and CS4 and upgrade to CS5. Buying the full version of Photoshop CS5 right now costs nearly $500, while the upgrade is only priced at ~$150."