Adobe Photoshop Licence has always prohibited users from making Photoshop a web service. It now look like Adobe is marketing Adobe I/O for users to use Adobe application in their Web application so Photoshop as a web service can now be done legally via Adobe I/O.
To me it look like Adobe I/O offering is targeted for Adobe's Enterprise customers for developing web Applications. To me it look like it be complex developing environment for developing reliable secure web applications. Adobe Photoshop Developers should use it.