FCP has many serious problems realted to audio sync, EDL accuracy and video levels. These issues are important to broadcasters.
FCP is slow and cumbersome to work with at this time, but who knows about the future? Perhaps, FOX is exploring the possibility of doing some offline work on on FCP to see how it goes.... or maybe FOX is getting into the 'wedding and birthday video' industry.
At any rate, this kind of activity should not be a threat to Avid in the near term.