2 Thoughts,
1. Apple has alienated 2 of it’s biggest partners Avid and Adobe with it’s own Pro Apps both were mainly Apple based until they started there own Pro Apps. The only thing Apple hasn’t done is make a Photoshop alternative although Aperture is fairly close. This has never made sense to me, they were competing against their own partners.
2nd is they could be selling FCPs code since it is 32bit Carbon base and not 64, and re-porting a whole new FCP from the ground up. I wouldn’t bet on this one though.