Well, yeah, sort of. The new FCP X is incompatible with FCP 7, which it replaced. That created huge headaches for shops that needed to add more FCP 7 workstations to their editing mix – and could not jump on FCP X mid-stream since it was not compatible with existing projects.
I still use FCP 7 but have begun using Sony Vegas because of the uncertainty Apple created with this move. FCP X looked more like a replacement for Final Cut Express – while FCP 7 was dead ended.