Daily Tech (as well as many others) are reporting now that Portions of Google Pack Coming to Linux. Google has apparently given the Codeweavers team the job of porting the app to run on Linux. This is a good move for Linux on the desktop, as IMHO, Picasa is a superb piece of photo management software.
However, for KDE users, you already have something just as good, and it’s a native KDE app. digiKam is the KDE Photo Management application, which may very well have been modeled after Google’s Picasa. Features include tagging, web-based album generation, camera-interfacing, watched folders, easy red-eye correction, cropping, and the list goes on and on and on. If you’re running KDE, check it out.