I know one FX shop that switched over to NUKE from Shake, and are pretty happy with it. Shake still runs under OSX, but it's a dead end. Apple may have sensed that enough people have moved on to not bother trying to win them back with a shiny new program. They seem less interested in winning over new segments of the Pro market -- and let's face it, that's their prerogative. If you're getting higher profit margins on iPhones and iPods over Mac Pros, I don't begrudge you from shifting your focus.
JK
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SCQT! Self-contained QuickTime ? pass it on!