Well a complete rewrite (at least for OSX) is coming.....

Apple is dropping support for the Carbon 64 libraries.  So everybody that didn't do what Stevie told them to start 8 years ago are going to be hosed.

"At the WWDC show last June, however, Adobe & other developers learned that Apple had decided to stop their Carbon 64 efforts. This means that 64-bit Mac apps need to be written to use Cocoa (as Lightroom is) instead of Carbon. This means that we'll need to rewrite large parts of Photoshop and its plug-ins (potentially affecting over a million lines of code) to move it from Carbon to Cocoa."